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FOC | Family List | FOC Vol. 25 | Orchidaceae | Bulbophyllum

4. Bulbophyllum sect. Corymbosa (Blume) Averyanov, Opred. Orkhid. Vetnama. 261. 1994.

短序组 duan xu zu

Diphyes sect. Corymbosae Blume, Bijdr. 315. 1825 ["Corymbosia"].

Rhizome creeping or straggling with roots sprouting mainly below pseudobulbs, or rhizome spreading to pendulous, with roots growing backward over or alongside rhizome until they reach substrate; new shoots arising from basal node of pseudobulb. Pseudobulbs distinct, apex with 1 leaf. Leaves persistent, thick. Inflorescences solitary, arising along length of rhizome or near pseudobulbs, with 3 to many flowers in a contracted to subumbellate raceme (an elongate raceme in Bulbophyllum reptans and B. polyrrhizum). Pedicel with base ± coinciding with attachment of subtending bract. Sepals free, margins glabrous, 1-3-veined; lateral sepals ca. as long as dorsal sepal or somewhat longer, not twisted inward near base (twisted inward in B. ledungense). Petals: margins glabrous, 1-3-veined; lip: margins without auricles or lateral lobes, otherwise ± glabrous, adaxially usually glabrous (with glandular hairs in B. odoratissimum). Column: stigma not protruding at its base, foot distinct; anther: front margin not projecting or projecting into a rounded beak, abaxially with or without a rounded crest; pollinia 4, inner more than 1/2 as long as outer, all without appendages.

Seventy-six provisionally accepted species: Himalayas to the Philippines and Sulawesi; 14 species (six endemic) in China.

Bulbophyllum reptans and B. polyrrhizum may not belong here. The first has spiral vessels in its flower parts similar to Continental African species such as B. pumilum (Swartz) Lindley.

1 Raceme elongate, more than 2 cm   (2)
+ Raceme umbellate or subumbellate, sometimes condensed-racemose   (3)
2 (1) Leaves deciduous before anthesis.   11 B. polyrrhizum
+ Leaves not deciduous at anthesis.   12 B. reptans
3 (1) Pseudobulbs close, less than 1 cm apart from each other on rhizome   (4)
+ Pseudobulbs spaced more than 1 cm apart from each other on rhizome   (9)
4 (3) Rhizome patent to pendulous, with roots growing backward alongside it to base   (5)
+ Rhizome creeping or straggling, with roots spreading   (6)
5 (4) Lateral sepals 2.3-7 mm; petal margins irregularly denticulate.   13 B. corallinum
+ Lateral sepals 21-23 mm; petal margins entire.   14 B. dulongjiangense
6 (4) Lateral sepals obviously longer than dorsal sepal   (7)
+ Sepals subequal in length   (8)
7 (6) Stelidia deltoid or broadly triangular.   15 B. sutepense
+ Stelidia narrowly triangular-subulate, slender.   16 B. rubrolabellum
8 (6) Floral bracts shorter than pedicel plus ovary; petals elliptic.   16 B. rubrolabellum
+ Floral bracts longer than pedicel plus ovary; petals ovate-lanceolate.   17 B. tengchongense
9 (3) Scape nearly as long as or slightly longer than pseudobulb   (10)
+ Scape more than 2 × as long as pseudobulb   (12)
10 (9) Rhizome stout, 3-4 mm in diam.; pseudobulbs 2-5 cm; dorsal sepal 7-10 mm.   18 B. cauliflorum
+ Rhizome slender, 1-2 mm in diam.; pseudobulbs 0.8-1.5 cm; dorsal sepal 4-6 mm   (11)
11 (10) Roots only from base of pseudobulbs; scape arising only from base of pseudobulb.   19 B. stenobulbon
+ Roots from all nodes of rhizome and base of pseudobulb; scape arising from base of pseudobulb or nodes between 2 pseudobulbs.   20 B. ledungense
12 (9) Lip adaxially and along margin with glandular hairs.   21 B. odoratissimum
+ Lip glabrous   (13)
13 (12) Stelidia rounded; petals obtuse.   22 B. wuzhishanense
+ Stelidia acute; petals acute to acuminate   (14)
14 (13) Lateral sepals adnate to column foot for 1/5-2/5 of their width; petals narrowly lanceolate, 4-5 mm, apex long acuminate; column foot ca. 0.5 mm, with almost invisible free part.   23 B. kwangtungense
+ Lateral sepals adnate to column foot over almost their entire width; petals ovate-lanceolate, 3-3.5 mm, apex acute; column foot ca. 2 mm, with its free part 0.8-1 mm.   24 B. shweliense


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