Lamourouxia integerrima Smith. Bot. Gaz.

Francisco-Gutiérrez, Antonio, Ruiz-Sanchez, Eduardo, González, Dolores & Lira-Noriega, Andrés, 2023, Lamourouxia (Orobanchaceae) of Mexico, Phytotaxa 582 (1), pp. 1921-1935 : 1921-1935

8. Lamourouxia integerrima Smith. Bot. Gaz. 13(7): 189–190. 1888.

Lectotype designated here:— GUATEMALA. Alta Verapaz : Pansamalá, 4000 ft, January 1887, H. von Tuerckheim 1112 (Lectotype: US0012570!; isolectotypes: GH00356761!, GH00078577!, K000533708!, NY00090606!, P02976356!, PH 00016832!, US00125703!, US 00125704!, US00125705!)

= Lamourouxia longiflora var. integerrima (Smith) Williams in Standley and Williams (1972: 121). Basionym: L. integerrima .

Figure 7 F–H .

Herbs up to 250 cm tall, stems branched along the plant, reclining, woody, glabrous. Leaves sessile, narrowly elliptic to lanceolate, 20–42 × 3–8 mm, margin entire, apex acute, base attenuate; membranous, glabrous to glabrescent, nonglandular. Inflorescence a raceme, erect, pedicels thin, 4–8 × 1 mm long. Bracts equal along inflorescence, sessile, lanceolate, 15–35 × 8 mm, margin entire, apex acute, base attenuate. Calyx campanulate without dots on the surface, 7–10 × 3–5 mm, lobes linear to narrowly oblanceolate, 2.7–7 × 1–1.5 mm, margin entire, apex acute, glabrous to glabrate, non-glandular. Corolla tubular, 43–51 × 9–11 mm, upper lip 14–19 mm long, lower lip 7–12 mm long, lobes 2–4 × 1–1.5 mm; brilliant red, pubescent, non-glandular. Stamens exserted 2, filaments, anthers, and style not seen. Stigma bilobed. Capsule ovoid, 10–14 × 7–8 mm. Seeds not seen.

Etymology: —The epithet integerrima means entire or untoothed in reference to the margin entire of the leaves.

Distribution and Ecology: —This species is distributed from Mexico to Guatemala. In Mexico, the species is distributed in the states of Chiapas and Oaxaca ( Fig. 7H ). The species was frequently collected in cloud forests and rarely in grassy flats at elevations between 1100 and 1700 m.

Phenology: — In Mexico, flowers of this species were collected from October to January and only one specimen with fruits is known from July. Most of the collections were made in December .

Discussion: —The taxon was classified as a variety of Lamourouxia longiflora by Williams in Standley & Williams (1972), regarding its broader and triangular calyx lobes, with the commentary “but probably not really distinct. Only known from Guatemala ”. No specimens were indicated as revised, and no other distinctive characters were given.

Lamourouxia integerrima is a separate species from L. longiflora by many morphological characters and ecological features. Lamourouxia integerrima belongs to the section Hemispadon , while L. longiflora pertains to the section Lamourouxia , which denotes differences in the development of stamens and anthers and the shape of the corolla (see key for sections). The distribution of L. integerrima is recorded from cloud forests in the southern states of Chiapas and Oaxaca; L. longiflora frequently inhabits pine and oak forests of the northern states of Chihuahua, Durango, Jalisco, and Zacatecas.

Nomenclatural notes:— The original description of Lamourouxia integerrima ( Smith 1888) included the text “Ex Pl. cit. 1112” in the protologue. Ernst (1972) cited one specimen in G, GH, PH, and three in US. Because a holotype was not indicated, a lectotype is here designated.

Examined specimens:— MEXICO: Chiapas: Larráinzar, near summit of Chuchil Ton, northeast of Bochil, 17 October 1972, Breedlove 29232 (MEXU!). La Trinitaria, 15 km east on road to Montebello, 04 December 1976, Breedlove 42086 (ENCB!, MEXU!); Lagunas de Montebello National Park along road to Cinco Lagunas, 29 January 1981, Breedlove 49696 (MEXU!). Pueblo Nuevo Solistahuacán, in the Selva Negra 10 km above Rayón Mezcalapa along road to Jitotol, 12 December 1971, Breedlove 23115, 25 November 1972, Breedlove & Dressler 29806 (ENCB!, MEXU!); La Selva Negra, 13 November 1964, MacDougall s.n. (ENCB!, MEXU!). Tziscao, 15 km al este sobre el camino a Santa Elena, 05 December 1983, Cabrera & de Cabrera 6107 (ENCB!, IBUG!). Oaxaca: Huautla de Jiménez, a 6.3 km del Puente de Fierro, por la terracería a Sta. María Chilchotla, 04 July 2001, Munn et al. 1317 (XAL!).

Figures

FIGURE 7. Lamourouxia gracilis. A) Inflorescence. B) Leaves. C) Immature infructescence. D) habit. E) Distribution map. Lamourouxia integerrima. F) Inflorescence. G) Leaves. H) Distribution map. Credits in Appendix I.