taxonID	type	description	language	source
03AB5A19FFD1FFA20292BC970A9FFBF8.taxon	description	The new species is morphologically similar to I. drepanophora, but differs from the latter in having bract with acute apex (vs. acuminate or aristate with 2 – 3 mm long awn), obliquely ovate lateral sepals, apex sub-acute without awn (vs. ovate-falcate, apex aristate with 2 – 3 mm long up-curved awn), lower sepal with ca. 1 mm long awn, apex acute (vs. aristate with 4 – 5 mm long awn), lateral united petals with lorate distal lobes (vs. oblong to dolabriform) (Table 1).	en	Hareesh, Vadakkoot Sankaran, Sabu, Mamiyil (2020): Two new balsams (Balsaminaceae) from Eastern Himalayas, India. Phytotaxa 437 (5): 291-300, DOI: 10.11646/phytotaxa.437.5.3, URL: http://dx.doi.org/10.11646/phytotaxa.437.5.3
03AB5A19FFD1FFA20292BC970A9FFBF8.taxon	materials_examined	Type: — INDIA. Arunachal Pradesh: West Siang district, 5 km away from Tirbin towards Along from Daporijo, ± 787 m, N 28 ° 1 ’ 28.42 ’’, E 94 ° 36 ’ 29.7 ’’, 18 September 2019, M. Sabu & V. S. Hareesh 158721 (holotype CAL!, isotypes, CAL!, MBGH!). Terrestrial succulent herbs, 30 – 45 cm long; stem rarely branched, terete, greenish brown, glabrous; internodes 3 – 6 cm long, dark pink at base and greenish pink towards the apex, glabrous; nodes swollen when mature. Leaves alternate at distal part and spirally arranged proximally along the stem, petiolate; lamina 4.5 – 12 × 2.5 – 5.5 cm, ovate or ovateelliptic, caudate-acuminate at apex, crenate at margin, crenations apiculate, cuneate at base, dark green above and pale green beneath, glabrous on both sides; lateral nerves 10 – 13 on each side of the mid-vein, abaxially prominent; petiole 1 – 3 cm long, slender, slightly winged, pale green, glabrous; petiolar glands subulate, pale green to pink, glabrous. Inflorescence a raceme, axillary, 15 – 20 - flowered; peduncle 6 – 12; bract 3 – 4 × 2 – 3 mm, navicular, acute at apex, pale green, glabrous, caducous. Flowers pale purple with yellow throat, pedicellate; pedicel 10 – 12 mm long at flowering and elongates up to 18 mm long in fruiting stage, pale green, glabrous; lateral sepals 2, 1.5 – 2 × 1 – 1.5 mm, obliquely-ovate, apex sub-acute, transparent with pale green midrib, glabrous; dorsal petal 6 – 7 × 5 – 6 mm, orbicular, dorsally slightly keeled middle towards the apex, apex shallowly emarginated, curved upwards, pale purple with pale green keeled portion, glabrous; lateral united petals 20.5 – 22.5 × 4 – 6 mm, 2 - lobed, pale purple with yellow throat; basal lobe 4.5 – 5.5 × 5 – 6 mm, obovate to triangular, non-clawed, pale purple; distal lobe 16 – 17 × 1 – 2 mm, lorate, twisted, rounded or obtuse at apex, pale purple; dorsal auricle absent; lower sepal 18 – 23 long, ca. 5.5 mm wide at mouth, navicular, pale purple, glabrous; mouth with ca. 1 mm long awn, apex acute, pale green; spur 5 – 7 mm long, cylindrical, outwardly curved, apex entire, pale purple, glabrous. Column 4 – 5 × ca. 1.5 mm, slightly bent towards the apex; filaments ca. 3 × 1.5 mm, white, glabrous; anthers ca. 1 × 1 mm, yellow, glabrous. Pistil 3 – 3.5 × ca. 1.5 mm; ovary ellipsoid, pale green, glabrous. Capsule 15 – 17 × ca. 3 mm, clavate, green, glabrous; seeds ca. 2 × 1 mm, obovate, cream. Phenology: — August to October	en	Hareesh, Vadakkoot Sankaran, Sabu, Mamiyil (2020): Two new balsams (Balsaminaceae) from Eastern Himalayas, India. Phytotaxa 437 (5): 291-300, DOI: 10.11646/phytotaxa.437.5.3, URL: http://dx.doi.org/10.11646/phytotaxa.437.5.3
03AB5A19FFD1FFA20292BC970A9FFBF8.taxon	etymology	Etymology: — The specific epithet is named after the type locality Tirbin, West Siang district, Arunachal Pradesh. Habitat and distribution: — The new species known only from near Tirbin, West Siang District of Arunachal Pradesh at an altitude of around 800 m a. s. l. It grows in the moist areas near the streams. At present, the new species perceive no serious threat in its habitat. We observed 8 populations with around more than 80 individuals near Tirbin, Towards Along from Daporijo (IUCN 2001).	en	Hareesh, Vadakkoot Sankaran, Sabu, Mamiyil (2020): Two new balsams (Balsaminaceae) from Eastern Himalayas, India. Phytotaxa 437 (5): 291-300, DOI: 10.11646/phytotaxa.437.5.3, URL: http://dx.doi.org/10.11646/phytotaxa.437.5.3
03AB5A19FFD2FFA50292B86A0B24FE54.taxon	description	The new species is morphologically similar to I. rugosipetala, but differs from the latter in having erect inflorescence (vs. pendent), white flowers with yellow throat (vs. brick red or reddish with yellow throat and margins), glabrous petals (vs. rugose) and clavate capsule (vs. linear). It also shows similarities with I. drepanophora but differs in having acute bract apex (vs. aristate with 2 – 3 mm long awn), obliquely-ovate to triangular lateral sepals with acuminate apex (vs. ovate-falcate, apex aristate with 3 mm long curved awn) and lorate distal lobe of lateral united petals (vs. oblong to dolabriform) (Table 2).	en	Hareesh, Vadakkoot Sankaran, Sabu, Mamiyil (2020): Two new balsams (Balsaminaceae) from Eastern Himalayas, India. Phytotaxa 437 (5): 291-300, DOI: 10.11646/phytotaxa.437.5.3, URL: http://dx.doi.org/10.11646/phytotaxa.437.5.3
03AB5A19FFD2FFA50292B86A0B24FE54.taxon	materials_examined	Type: — INDIA. Arunachal Pradesh: Shi-Yomi district, 7 km away from Siko Dido Water fall towards Mechuka, ± 1200 m, N 28 ° 30 ’ 8.82 ”, E 94 ° 24 ’ 51.07 ”, 19 September 2019, M. Sabu & V. S. Hareesh 158764 (holotype CAL!, isotypes, CAL!, MBGH!) Terrestrial non-succulent herbs, 25 – 40 cm long; stem branched, sub-terete or rarely minutely ridged, pale green, glabrous; internodes 1 – 2.5 cm long, pale pinkish-green at base and pale green towards the apex, glabrous; nodes swollen when mature. Leaves alternate at distal part and spirally arranged proximally along the stem, petiolate; lamina 2.5 – 12 × 2 – 8.5 cm, ovate or elliptic, caudate-acuminate at apex, crenate at margin, crenations apiculate, cuneate at base, dark green above and pale beneath, glabrous on both sides; lateral nerves 5 – 9 on each side of the mid-vein, abaxially prominent; petiole 1 – 2.5 cm long, slender, slightly winged, pale green, glabrous; petiolar glands rare, subulate, pale green, glabrous. Inflorescence axillary raceme, 5 – 7 - flowered; peduncle 8 – 10 cm long, glabrous; bract ca. 2 × 2.5 mm, ovate, acute at apex, pale green, glabrous, caducous. Flowers white with yellow throat; pedicel 10 – 14 mm long at flowering and elongates up to 15 – 17 mm long in fruiting stage, pale green, glabrous; lateral sepals 2, 2 – 2.5 × ca. 0.8 mm, obliquely-ovate to triangular, apex acuminate, transparent or pale green with pale pink coloration towards the apex, glabrous; dorsal petal 10 – 12 × 10 – 11 mm, orbicular, apex shallowly emarginated, white, glabrous; lateral united petals 23 – 27 × 5 – 5.5 mm, 2 - lobed, white with yellow throat; basal lobe 6 – 7 × 5 – 5.5 mm, obovate to triangular, yellow with white towards the margins; distal lobe 17 – 20 × 1.5 – 2 mm, lorate, twisted, rounded or obtuse at apex, white; dorsal auricle inconspicuous, deep yellow; lower sepal 15 – 18 × 5 – 7 mm at mouth, navicular, apex with ca. 6 mm sharp beak, white, faced straight in floral bud and re-curved and faced parallel to the lower sepal in flowering stage, glabrous; spur 12 – 15 mm long, cylindrical, apex entire, deeply outwardly curved, white, glabrous. Column 3.5 – 4 × 1.5 – 2.5 mm, slightly bent towards the apex; filaments ca. 2 × 1 mm, white, glabrous; anthers ca. 1.5 × 2 – 2.5 mm, yellow, glabrous. Pistil ca. 2.5 × 1 mm; ovary ellipsoid, pale green, glabrous. Capsule 11 – 14 × ca. 2 mm, clavate, green, glabrous; seeds ca. 2 × 1.5 mm, obovate, cream. Phenology: — August to October	en	Hareesh, Vadakkoot Sankaran, Sabu, Mamiyil (2020): Two new balsams (Balsaminaceae) from Eastern Himalayas, India. Phytotaxa 437 (5): 291-300, DOI: 10.11646/phytotaxa.437.5.3, URL: http://dx.doi.org/10.11646/phytotaxa.437.5.3
03AB5A19FFD2FFA50292B86A0B24FE54.taxon	etymology	Etymology: — The specific epithet named after Shi-Yomi District, one of the newly formed district in Arunachal Pradesh, type locality of the taxon. Habitat and distribution: — The new species known only from type locality, 7 km from Siko Dido Water fall towards Mechuka, Shi-Yomi District of Arunachal Pradesh. Populations were observed moist areas near the streams at an altitude of around 1200 m a. s. l. During our expedition, we observed only three populations with more than 30 mature individuals. At present, the new species faces no serious threat. However, road broadening may affect the natural habitat, which would result in the decrease in number of Individuals (IUCN 2001). Further conservation measures are needed. Note: — Impatiens drepanophora is one of the widespread balsams distributed in the Eastern Himalayan regions of China, India, Myanmar and Nepal. Though, the flowers show variations in the colour patters, certain floral characters such as the presence of prominent awn on the apex of bracts, lateral sepals and lower sepal (falcate) are constant. Yellow coloured flowers are common throughout the Himalayas (Figs. 5). However, white coloured forms are also reported form Myanmar (Ruchisansakun et al. 2018) and pale purple forms from China (Yu 2012). During the expeditions in Arunachal Pradesh, we noticed purple forms of I. drepanophora which occur towards Along from Mechuka (Figs. 6). The entire plant (both vegetative and reproductive) shows maximum similarities with the yellow forms except in the moderate curvature of the lateral sepal’s awn (Figs. 6 E & H).	en	Hareesh, Vadakkoot Sankaran, Sabu, Mamiyil (2020): Two new balsams (Balsaminaceae) from Eastern Himalayas, India. Phytotaxa 437 (5): 291-300, DOI: 10.11646/phytotaxa.437.5.3, URL: http://dx.doi.org/10.11646/phytotaxa.437.5.3
