taxonID	type	description	language	source
D90E720BFF96FFF0FF00F8E2FA74AEB8.taxon	materials_examined	Type: — INDIA. Arunachal Pradesh: Lower Dibang Valley district, Mayodia, 2100 m, 06 May 2016, V. S. Hareesh 143761 holotype: CALI!; isotypes: CAL!, CALI!)	en	Hareesh, Vadakkoot Sankaran, Kumar, Pankaj, Sabu, Mamiyil (2017): Pleione arunachalensis (Orchidaceae: Epidendroideae: Arethuseae: Coelogyninae), a new species from North-East India. Phytotaxa 291 (4): 294-298, DOI: 10.11646/phytotaxa.291.4.7, URL: http://dx.doi.org/10.11646/phytotaxa.291.4.7
D90E720BFF96FFF0FF00F8E2FA74AEB8.taxon	diagnosis	Diagnosis: Pleione arunachalensis sp. nov. shows affinity with P. chunii and P. hookeriana but differs from the latter two in having broadly ovate lip with obtuse apex and minutely undulate margin; lip purple with brownish yellow towards the apex; 4 rows of papillae on the disc and column apex truncate.	en	Hareesh, Vadakkoot Sankaran, Kumar, Pankaj, Sabu, Mamiyil (2017): Pleione arunachalensis (Orchidaceae: Epidendroideae: Arethuseae: Coelogyninae), a new species from North-East India. Phytotaxa 291 (4): 294-298, DOI: 10.11646/phytotaxa.291.4.7, URL: http://dx.doi.org/10.11646/phytotaxa.291.4.7
D90E720BFF96FFF0FF00F8E2FA74AEB8.taxon	description	Description: Lithophytic herb up to 11 – 15 cm long. Pseudobulbs 28 – 32 × 14 – 16 mm, ovoid-conical with an elongated neck, glabrous, green or greenish black, covered with remains papery brown sheaths. Leaf solitary, plicate, lamina 4.5 – 5 × 1.3 – 1.5 cm, oblanceolate, acuminate, glabrous, pale green or greenish black. Inflorescence erect, 1 - flowered; peduncle 5.5 – 5.7 cm long, slender, glabrous, deep pink; bract 15 – 18 × 6 – 7 mm, obovate to oblanceolate, obtuse, cymbiform and embracing the ovary, glabrous, pinkish brown; pedicel c. 4 – 5 mm long, pale pink, glabrous. Flower 5 – 5.5 cm across, deep pink; dorsal sepal 30 – 33 × 4 – 5 mm, oblanceolate, subacute, 5 - nerved, glabrous, deep pink; lateral sepals 30 – 32 × 7 – 8 mm, oblanceolate, acuminate at apex, glabrous, deep pink; petals spreading, 35 – 36 × 4 – 5 mm linear-oblanceolate, obtuse or sub-acute at apex, glabrous, deep pink; lip 33 – 35 × 25 – 27 mm, obscurely 3 - lobed towards the apex, broadly ovate when flattened, obtuse at apex, margin minutely undulate; callus of 4 lines of long papillae 14 mm apart from the base and extends towards the apex. Column sub-clavate, 15 – 16 mm long, winged along both sides, wings broadened upward, truncate at apex, glabrous, white with purple shade towards the wings. Ovary 8 – 10 mm long, glabrous, pinkish brown. Anther cap 5 – 6 × 4 mm. Pollinia 1.7 mm long, oblong. Phenology: Late April – June.	en	Hareesh, Vadakkoot Sankaran, Kumar, Pankaj, Sabu, Mamiyil (2017): Pleione arunachalensis (Orchidaceae: Epidendroideae: Arethuseae: Coelogyninae), a new species from North-East India. Phytotaxa 291 (4): 294-298, DOI: 10.11646/phytotaxa.291.4.7, URL: http://dx.doi.org/10.11646/phytotaxa.291.4.7
D90E720BFF96FFF0FF00F8E2FA74AEB8.taxon	etymology	Etymology: Named after the state of Arunachal Pradesh in India where this species was discovered.	en	Hareesh, Vadakkoot Sankaran, Kumar, Pankaj, Sabu, Mamiyil (2017): Pleione arunachalensis (Orchidaceae: Epidendroideae: Arethuseae: Coelogyninae), a new species from North-East India. Phytotaxa 291 (4): 294-298, DOI: 10.11646/phytotaxa.291.4.7, URL: http://dx.doi.org/10.11646/phytotaxa.291.4.7
D90E720BFF96FFF0FF00F8E2FA74AEB8.taxon	distribution	Distribution and Ecology: The new species known only from Mayodia pass, Lower Dibang Valley district of Arunachal Pradesh, North-East India. The new species grows in the moist rocky areas in association with moss at an elevation varies from 2000 to 2100 m. The area characterised by heavy snowfall in January and February, snowfall starts in November and continues occasionally till April. Conservation status: The new species has so far only been collected from the type locality. The area of occupancy is estimated to be less than 4 km 2 and the known populations contain a maximum of 20 – 50 plants. The new species perceive serious threat of existence due to widening of the roads, and other developmental activities which may lead to loss of its natural habitat. Based on these information the new species has been assessed as Critically Endangered [B 2 ab (iii, iv, v); D] based on IUCN (2013). This is a provisional threat assessment; more field studies are needed to confirm the status. For the time being, we are trying to grow the plants for conservation at Calicut University Botanical Garden (CUBG).	en	Hareesh, Vadakkoot Sankaran, Kumar, Pankaj, Sabu, Mamiyil (2017): Pleione arunachalensis (Orchidaceae: Epidendroideae: Arethuseae: Coelogyninae), a new species from North-East India. Phytotaxa 291 (4): 294-298, DOI: 10.11646/phytotaxa.291.4.7, URL: http://dx.doi.org/10.11646/phytotaxa.291.4.7
