taxonID	type	description	language	source
974C45A6BC115E62B9467EE90AF4A345.taxon	description	Description. Plants to ca. 1 meter tall, covered with scabrid, glochidiate and stinging trichomes, glandular trichomes inconspicuous or absent. Stems erect, cylindrical to ca. 1 cm diam. Leaves opposite, petiolate, petiole 2 – 4 cm, leaf blades pinnately veined, 6 – 15 × (2 –) 3 – 7 cm, narrowly ovoid to ovoid or triangular, with 4 – 8 lobes per side, in some leaves shallow and poorly defined, triangular, from wider than long to longer than wide, apices acute, the largest of a leaf 0.5 – 2.5 × 0.5 – 2 cm, the second or third usually the largest, becoming progressively smaller apically, margins serrate, each tooth with a hydatode, base cuneate, rounded or truncate, apex acuminate. Inflorescence a monochasial or dichasial cyme, 10 – 50 cm long, bracts alternate, one per flower, usually shorter and proportionally much narrower than the vegetative leaves, elliptical, 1.5 – 4 × 0.3 – 0.7 cm, diminishing in length, and particularly width, towards the inflorescence apex. with 4 – 7, broadly triangular, shallow, often indistinct lobes, base cuneate to rounded. Pedicels 1.5 – 2.5 cm long in anthesis, straight, often horizontal but ranging between 45 ° above or below the horizontal, the apex deflexed. Flowers deflexed, 3 – 6 per inflorescence branch. Sepals 5, narrowly triangular or ovate, apex acuminate, yellowish-green, 1.2 – 2 × 0.5 – 0.7 cm, with 3 main veins, as long or slightly shorter than the petals. Petals 5, orange red to carmine, shallowly cymbiform, oblanceolate, base narrower than the limb but claw short and poorly differentiated (to 4 mm wide), 1.5 – 2 × 0.6 – 1 cm, with 3 evident main veins, tip rounded or obtuse, basal gaps between petals leave the scale bases visible (gaps often not visible because they are either very small or hidden by the sepals), corolla more or less cylindrical, as wide basally as distally. Nectar scales 5, orange or red, 10 mm long and 3 mm wide at base, with 2 distinct, broadly ovoid, seemingly smooth (when fresh) nectar sacs at the base, each one as wide as the nectar scale back (ca. 2.5 mm in diameter), nectar scale back rectangular, narrow, 5.5 × 2 mm, straight, surface papillose, with 0, 2 or 3 short filiform threads, inserted subapically, <1 mm long and with two horizontal wings, 3 – 4 × 1.5 mm. Staminodes 2 per scale, to 14 mm long, slightly sigmoid, narrowing apically, base papillose, apex filiform. Stamens in 5 antepetalous fascicles with 8 – 10 each, filaments to 12 mm long, anthers 1 × 0.5 mm, elliptical, cream before dehiscence, whitish when shedding pollen, black after pollen is shed. Ovary broadly conical to hemispherical, with a rounded base, ca. 5 – 6 × 5 – 6 mm, with 3 parietal placentae. Stigma lobes 3, shortly decurrent on the style surface, style to ca. 15 mm long. Fruit a broadly clavate to conical capsule on an erect pedicel, 3.5 – 5 cm long, with persistent sepals and a shortly tapering base, mature capsule 20 – 30 × 10 – 12 mm (width at sepal insertion), including an elongated conical apical projection, opening by the three apically dehiscing valves. Seeds not seen.	en	Henning, Tilo, Allen, Joshua P., Montesinos-Tubeé, Daniel, Rodríguez-Rodríguez, Eric F., Peña, José Luis Marcelo, Acuña-Castillo, Rafael (2025): No end to endemism – contributions to the difficult Nasa Weigend Series Alatae (Loasaceae). A new species from Peru and the rehabilitation of “ Loasa ” calycina Benth. PhytoKeys 252: 163-186, DOI: 10.3897/phytokeys.252.141635
974C45A6BC115E62B9467EE90AF4A345.taxon	distribution	Distribution. Nasa calycina is endemic to Loja and Zamora-Chinchipe (Fig. 1), mostly known from areas near or within Podocarpus National Park (mostly around the Cajanuma sector), where Nasa loxensis is missing. There is a single record between La Argelia and La Palma in an unprotected area where it seems to meet the southernmost range of Nasa loxensis. Further south in Loja (and reaching Piura, Peru), both taxa seem to be replaced by Nasa amaluzensis, a species that is florally quite close to Nasa calycina but differs significantly in leaf morphology.	en	Henning, Tilo, Allen, Joshua P., Montesinos-Tubeé, Daniel, Rodríguez-Rodríguez, Eric F., Peña, José Luis Marcelo, Acuña-Castillo, Rafael (2025): No end to endemism – contributions to the difficult Nasa Weigend Series Alatae (Loasaceae). A new species from Peru and the rehabilitation of “ Loasa ” calycina Benth. PhytoKeys 252: 163-186, DOI: 10.3897/phytokeys.252.141635
E44E738BF6F254E2B7D0D703436E03ED.taxon	description	Figs 2, 3 C	en	Henning, Tilo, Allen, Joshua P., Montesinos-Tubeé, Daniel, Rodríguez-Rodríguez, Eric F., Peña, José Luis Marcelo, Acuña-Castillo, Rafael (2025): No end to endemism – contributions to the difficult Nasa Weigend Series Alatae (Loasaceae). A new species from Peru and the rehabilitation of “ Loasa ” calycina Benth. PhytoKeys 252: 163-186, DOI: 10.3897/phytokeys.252.141635
E44E738BF6F254E2B7D0D703436E03ED.taxon	diagnosis	Diagnosis. The new species is morphologically most similar to Nasa calycina comb. nov. (see below) and differs from it in its very elongated stems, subscandent habit, proportionately broader leaf blades with a conspicuously deeply cordate base, sepals and petals almost twice as long (to 4 cm and 4.5 cm respectively), sepals and petals of equal length and nectar scales with 3 conspicuous apical dorsal threads up to 5 mm long.	en	Henning, Tilo, Allen, Joshua P., Montesinos-Tubeé, Daniel, Rodríguez-Rodríguez, Eric F., Peña, José Luis Marcelo, Acuña-Castillo, Rafael (2025): No end to endemism – contributions to the difficult Nasa Weigend Series Alatae (Loasaceae). A new species from Peru and the rehabilitation of “ Loasa ” calycina Benth. PhytoKeys 252: 163-186, DOI: 10.3897/phytokeys.252.141635
E44E738BF6F254E2B7D0D703436E03ED.taxon	description	Description. Plants to 1.5 – 3 (– 4) meters tall, covered with scabrid, and stinging trichomes, glochidiate trichomes restricted to the abaxial surface of the leaves along the veins. Stinging hairs (setae) scattered all over the plant but most densely on the stem, ovary, sepals (= fruit) and along the veins of the leaves. Apical parts of the petals set with few glandular hairs. Stems upright when young or growing in open areas, climbing through and leaning on adjacent vegetation when growing in dense undergrowth, base slightly woody. Leaves opposite, petiolate, petiole up to 13 cm long, leaf blades pinnately veined, 7 – 11 × 5 – 10 cm, widely ovoid to triangular, with 3 – 7 obtuse triangular lobes on each side, the lower ones up to 3 cm wide and 1.5 cm long, gradually decreasing in size towards the apex, the upper ones inconspicuous, margins serrate, each tooth with a hydatode, base conspicuously cordate (sinus to 1 cm deep). Inflorescence a monochasial or dichasial cyme, bracts alternate to 3 × 1.5 cm, one per flower, smaller than vegetative leaves, base shallowly cordate to truncate. Sepals 5, persistent, long acuminate, green, up to and 3.5 – 5 × 0.6 – 0.8 cm when fruiting, with 3 main veins, temporarily spreading in early anthesis, closely fitting on the petals later and further contracting in fruit. Petals 5, scarlet red, shallowly cymbiform, oblanceolate, base narrower than the limb but claw poorly differentiated, 3.5 – 4.5 × 1 – 1.5 cm, with 3 evident main veins, gaps between petals let the nectar sacs and scale bases visible when calyx lobes removed. Nectar scales 5, orange, 19 – 21 mm long and 5 – 6 mm wide at base, with 2 distinct, broadly ovoid, seemingly smooth (when fresh) nectar sacs at the base, each one as wide as nectar scale back (3 mm in diameter), nectar scale back rectangular, narrow 15 × 3 mm, straight papillose, margins with even longer papillae, ending in 3 conspicuous, distinct dorsal threads, inserted apically, up to 5 mm long and with two horizontal wings, seemingly smooth, 7 × 4 mm and diverging 90 – 120 ° from the back. Staminodes 2 per scale, c. 22 mm long, slightly sigmoid, base papillose, apex filiform. Stamens in 5 antepetalous fascicles with 10 – 20 each, anthers whitish when shedding pollen. Ovary broadly conical, with a rounded base, 5 × 5 mm, with 3 parietal placentae. Stigma lobes 3, decurrent on the style surface. Fruit a broadly clavate capsule with a globose base, 20 – 25 mm long (without sepals) and 8 – 10 mm wide at sepal insertion, opening with three apical valves. Seeds numerous, ovoid, 2.5 mm long and 1.5 mm wide, testa black and reticulate.	en	Henning, Tilo, Allen, Joshua P., Montesinos-Tubeé, Daniel, Rodríguez-Rodríguez, Eric F., Peña, José Luis Marcelo, Acuña-Castillo, Rafael (2025): No end to endemism – contributions to the difficult Nasa Weigend Series Alatae (Loasaceae). A new species from Peru and the rehabilitation of “ Loasa ” calycina Benth. PhytoKeys 252: 163-186, DOI: 10.3897/phytokeys.252.141635
E44E738BF6F254E2B7D0D703436E03ED.taxon	etymology	Etymology. The new species is named after Katja Lohse, beloved partner of the first author, mother of their children and steady supporter of his scientific endeavors.	en	Henning, Tilo, Allen, Joshua P., Montesinos-Tubeé, Daniel, Rodríguez-Rodríguez, Eric F., Peña, José Luis Marcelo, Acuña-Castillo, Rafael (2025): No end to endemism – contributions to the difficult Nasa Weigend Series Alatae (Loasaceae). A new species from Peru and the rehabilitation of “ Loasa ” calycina Benth. PhytoKeys 252: 163-186, DOI: 10.3897/phytokeys.252.141635
E44E738BF6F254E2B7D0D703436E03ED.taxon	distribution	Distribution and ecology. Nasa katjae has so far only been collected a few times. The type collection was made about 5 km north of Colasay (Cajamarca, Peru, Fig. 1 A). It grows only in, and at the edges of small streams in the highest part of this isolated forest fragment (Fig. 1 B – D). It is associated with the typical floristic elements in these “ bosques montanos húmedos ” such as Chusquea sp., Fuchsia sp., Vernonanthura sp., Saurauia sp., Miconia spp. and Viburnum sp. The forest in the uppermost regions is largely intact and only disturbed by small paths and some recent, small-scale clearings. However, the increasing negative impact of livestock farming is evident from the cattle tracks visible everywhere along the paths and already within the forest fragments. The plants are adapted to the very dense vegetation by a flexible growth habit. In the few more open areas where the path crosses the streams, the plants grow upright and begin to flower at a height of 1 to 1.50 m. In the wettest parts, where the dense primary vegetation consists mainly of impenetrable bamboo thickets (Chusquea sp.), the plants continue to grow in length until they reach an open area to display their flowers. Although difficult to measure, some individuals easily reach a size of more than 4 m. The flowers are typical “ hummingbird-pollinated ” flowers thus having open space around them is vital for successful pollination. All Nasa species are protandrous and exhibit a thigmonastic stamen movement and staggered stamen maturation (Weigend et al. 2010; Henning and Weigend 2012). In the taxa pollinated by hummingbirds, this movement is reduced to a minimum both geometrically (i. e. the angle the stamens bend) and temporally (the number of moved stamens = pollen packets in time). N. katjae sp. nov. has erect petals (in contrast to spreading petals in insect-pollinated taxa), therefore the stamen hardly move towards the center, and the pollen dispersal is limited to a successive maturation and dehiscence of the anthers. This is a secondary adaptation to the unreliable visitation probability and the random and long distances hummingbirds transport the pollen (Henning et al. 2018). However, we could not observe any visits to the plants. Ripe fruits with full seed set were found. The new species must be considered narrowly endemic to the overall area. It has been found twice at a spring area called “ Agua Fria ” which is the type locality. Only very recently, two new observations have come to our knowledge that, according to the locality-data on iNaturalist, have taken place some approximately 2.5 km further east. However, it is very likely that the species follows the streams downhill through the forest and inhabits suitable areas within the primary forest in all directions.	en	Henning, Tilo, Allen, Joshua P., Montesinos-Tubeé, Daniel, Rodríguez-Rodríguez, Eric F., Peña, José Luis Marcelo, Acuña-Castillo, Rafael (2025): No end to endemism – contributions to the difficult Nasa Weigend Series Alatae (Loasaceae). A new species from Peru and the rehabilitation of “ Loasa ” calycina Benth. PhytoKeys 252: 163-186, DOI: 10.3897/phytokeys.252.141635
E4AA965F33C75024B281AD970B4951B0.taxon	description	Fig. 3 A	en	Henning, Tilo, Allen, Joshua P., Montesinos-Tubeé, Daniel, Rodríguez-Rodríguez, Eric F., Peña, José Luis Marcelo, Acuña-Castillo, Rafael (2025): No end to endemism – contributions to the difficult Nasa Weigend Series Alatae (Loasaceae). A new species from Peru and the rehabilitation of “ Loasa ” calycina Benth. PhytoKeys 252: 163-186, DOI: 10.3897/phytokeys.252.141635
E4AA965F33C75024B281AD970B4951B0.taxon	description	Description. Plants to ca. 1.5 m tall, covered with scabrid, glochidiate and stinging trichomes, glandular trichomes inconspicuous or absent. Stems erect, cylindrical, to 1 cm diam., base woody. Leaves opposite, petiolate, petioles 1 – 6 cm long, leaf blades pinnately veined, 3 – 14 × 2 – 8.5 (– 11.5) cm, triangular to ovate, with 1 – 6 lobes per side, widely triangular to ovate, apices acute or rounded, the largest of a leaf, 0.5 – 2 (– 4.5) × 0.4 – 2 (– 3) cm, the first or second often the largest (the third less commonly so), progressively smaller apically, margins serrate to denticulate, each tooth with a hydatode, base rounded, truncate or shallowly cordate (sinus to 5 mm deep), apex acuminate. Inflorescence a monochasial or dichasial cyme, 7 – 30 cm long, bracts alternate, one per flower, usually shorter and proportionally much narrower than the vegetative leaves, elliptical, 1 – 8 × 0.2 – 3.2 cm, diminishing in length, and particularly width, towards the inflorescence apex with 4 – 7, broadly triangular, shallow to very shallow lobes, base rounded. Pedicels 2.5 – 3.6 cm long in anthesis, often horizontal but ranging to 45 ° above or below the horizontal, the apex deflexed. Flowers deflexed, up to 7 per inflorescence branch. Sepals 5, ovate triangular, apex acute to acuminate, green, 0.7 – 1.3 × 0.4 – 0.7 cm, with three main veins, evidently much shorter than the petals. Petals 5, orange to red, shallowly cymbiform, base narrower than the limb but claw short and poorly differentiated (to 4 mm wide), 2.5 – 3.8 × 0.8 – 1 cm, with 3 evident main veins, tip acuminate, basal gaps between petals leave the scale bases visible (gaps often visible, sepals too short to hide them), corolla wider at base, tapering distally. Nectar scales 5, yellow to orange red, going from lighter yellow on the back to darker orange on sacs and red orange on neck, 11 – 16 mm long and ca. 3 mm wide at the base, basally on back with two depressed globose sacs 2 mm in diam., nectar scale back rectangular narrow, papillose, dorsal threads 0, 2 or 3, short, <1 mm long (very rarely longer), inserted subapically, scale neck thickened, slightly recurved, laterally protracted into two horizontal wings 5 mm long and 1 mm wide. Staminodia 2 per scale, 17 mm, narrowing apically, apex filiform, more or less sigmoid, slightly papillose, white. Stamens, usually extending beyond the petals during the male phase, in 5 antepetalous fascicles of 13 – 16 each, filaments to 30 + mm long, anthers 1.5 mm long and 1 mm wide, elliptical, cream before dehiscence, whitish when shedding pollen, black after pollen is shed. Ovary broadly conical or hemispherical, with a rounded base, to 7 × 5 – 6 mm, with 3 parietal placentae. Stigma lobes 3, shortly decurrent on the style surface, style to ca. 30 mm long. Fruit a clavate or cylindrical capsule with persistent sepals, pedicel erect, 25 – 55 mm long, mature capsule 21 – 27 (– 30) x 11 – 13 (– 14) mm (width at sepal insertion) including a short or elongated conical apical projection, opening by the three apically dehiscing valves, base rounded, less commonly tapering. Seeds numerous, dark brown, ovoidal, testa reticulate.	en	Henning, Tilo, Allen, Joshua P., Montesinos-Tubeé, Daniel, Rodríguez-Rodríguez, Eric F., Peña, José Luis Marcelo, Acuña-Castillo, Rafael (2025): No end to endemism – contributions to the difficult Nasa Weigend Series Alatae (Loasaceae). A new species from Peru and the rehabilitation of “ Loasa ” calycina Benth. PhytoKeys 252: 163-186, DOI: 10.3897/phytokeys.252.141635
E4AA965F33C75024B281AD970B4951B0.taxon	distribution	Distribution. Nasa loxensis has a wide distribution in southern Ecuador, found in the provinces of Cañar, Azuay, Loja and apparently Morona-Santiago (Fig. 1). It is one of the most frequently collected species of Nasa in Ecuador as it can be found growing near human settlements, frequently visited national parks, and in both pristine and degraded habitats. At its southernmost distribution limits, it is suddenly replaced by Nasa calycina, farther to the SW, Nasa amaluzensis replaces both taxa. Further north in Tungurahua and Cotopaxi, similar Nasa auca can be found. As indicated above, a disjunct distribution at the southern end of the Amotape-Huancabamba Zone in Peru (Cajamarca, Prov. Chota) appears possible but needs further examination and material.	en	Henning, Tilo, Allen, Joshua P., Montesinos-Tubeé, Daniel, Rodríguez-Rodríguez, Eric F., Peña, José Luis Marcelo, Acuña-Castillo, Rafael (2025): No end to endemism – contributions to the difficult Nasa Weigend Series Alatae (Loasaceae). A new species from Peru and the rehabilitation of “ Loasa ” calycina Benth. PhytoKeys 252: 163-186, DOI: 10.3897/phytokeys.252.141635
