Bulbophyllum (sect. Brachystachyae)
Creators: name: Nguyen, Dinh Hiep
name: Averyanov, Leonid V.
name: Dang, Van Son
name: Pham, Phuoc Dien
name: Maisak, Tatiana
name: Bui, Van Huong
name: Dang, Minh Quan
name: Truong, Ba Vuong
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Liliopsida
Asparagales
Orchidaceae
Bulbophyllum

description: Artificial key to species of Bulbophyllum sect. Brachystachyae in the flora of Vietnam
1a. Inflorescence with dense flowers (flowers touching each other) .......................................................................................................2
1b. Inflorescence with lax flowers (flowers do not touch each other) .....................................................................................................9
2a. Inflorescence cylindrical, up to 8 cm long .........................................................................................................................................3
2b. Inflorescence globular or ovoid, less than 2.5 cm long......................................................................................................................4
3a. Dorsal sepal adaxialy papillose; stelidia pointing forward............................................................................................. B. ustulatum 3b. Dorsal sepals adaxially smooth; stelidia curved upwards ............................................................................................ B. khasyanum
4a. Pseudobulbs much reduced, hardly visible, less than 5 mm long ......................................................................................................5
4b. Pseudobulbs distinct, to 11 mm long..................................................................................................................................................8
5a. Apex of petals truncate, margin erose .................................................................................................................................. B. repens
5b. Apex of petals rounded or shortly mucronate, margin entire.............................................................................................................6
6a. Leaf blade to 6 cm long; inflorescence longer than 3 cm ...................................................................................................................7
6b. Leaf blade to 2.5 cm long; inflorescence less than 2 cm long......................................................................................... B. xuansonii
7a. Flowers uniformly green or pale yellow, pedicellate; lower margin of stelidia with distinct, oblique triangular tooth ...................... ..................................................................................................................................................................................... B. xylophyllum
7b. Flowers dark purple-red, sessile; lower margin of stelidia with inconspicuous, rounded tooth ..................................... B. gracilipes
8a. Pseudobulbs globular, erect; stelidia without upper teeth, lower teeth triangular............................................................ B. apiferum
8b. Pseudobulbs ovoid, oblique; upper teeth in stelidia present, rounded, lower teeth rounded ............................................. B. poilanei
9a. Stelidia and upper teeth equal, lower teeth ca. 0.5 mm long........................................................................................ B. bidoupense
9b. Teeth of stelidia unequal, lower teeth ca. 0.2 mm long.................................................................................................... B. alcicorne
description: Published as part of Nguyen, Dinh Hiep, Averyanov, Leonid V., Dang, Van Son, Pham, Phuoc Dien, Maisak, Tatiana, Bui, Van Huong, Dang, Minh Quan & Truong, Ba Vuong, 2021, Bulbophyllum xuansonii (Orchidaceae), a new miniature orchid from northern Vietnam and new national record of B. gracilipes, pp. 150-156 in Phytotaxa 522 (2) on pages 155-156, DOI: 10.11646/phytotaxa.522.2.7, http://zenodo.org/record/5556286