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FOC | Family List | FOC Vol. 25 | Orchidaceae

41. Peristylus Blume, Bijdr. 404. 1825.

阔蕊兰属 kuo rui lan shu

Authors: Xinqi Chen, Stephan W. Gale & Phillip J. Cribb

Glossaspis Sprengel; Glossula Lindley.

Herbs, terrestrial, slender to robust, medium-sized. Tubers subglobose to ellipsoid-oblong, undivided, fleshy, neck with several slender roots. Stem erect, with 2 or 3 tubular sheaths at base, 1- to many leaved, glabrous. Leaves basal, clustered midway along stem or widely spaced, elliptic, ovate, oblanceolate, or linear, base contracted into amplexicaul sheath. Inflorescence erect, terminal, racemose, glabrous; peduncle often with 1 to several sterile bracts; rachis laxly to densely many flowered. Flowers spirally arranged, resupinate, small, sometimes spidery, green, yellowish green, or white; ovary and pedicel usually erect and held close to rachis, twisted, cylindric-fusiform, slender, usually glabrous. Sepals free; dorsal sepal erect; lateral sepals usually spreading, rarely reflexed. Petals often connivent with dorsal sepal and forming a hood, slightly fleshy; lip connate with column at base, distally 3-lobed or rarely entire, larger than sepals and petals, slightly fleshy, spurred at base, ecallose or with a fleshy callus above mouth of spur; spur short and scrotiform, or sometimes elongate and cylindric, usually much shorter than ovary. Column erect, very short, stout; anther with 2 parallel or slightly divergent locules; pollinia 2, granular-farinaceous, sectile, each attached to a viscidium via a short caudicle; viscidia often small, naked, elliptic, ovate, or suborbicular; rostellum small, with short, inconspicuous arms; stigma lobes 2, basally connate but diverging widely, convex, globose or subclavate, often adnate to base of lip; auricles 2, prominent, placed laterally at base of anther.

About 70 species: E, S, and SE Asia to New Guinea, NE Australia, and the SW Pacific islands; 19 species (five endemic) in China.

After publication of the treatment for the Flora of China, one species was newly recorded from China (see JIN Xiao-Hua et al. 2010. Acta Bot. Yunnan. 32: 331-333, i.e., Peristylus superanthus J. J. Wood).

1 Lip entire   (2)
+ Lip 3-lobed   (4)
2 (1) Leaves linear, 0.2-0.3 cm wide; spur 5.5-6(-8) mm, ca. as long as ovary.   17 P. forrestii
+ Leaves oblong, oblong-elliptic, elliptic-lanceolate, or lanceolate, 0.7-2 cm wide; spur 0.7-1.2 mm, much shorter than ovary   (3)
3 (2) Plants 2-5-leaved; floral bracts ca. 8 mm, exceeding flower.   18 P. forceps
+ Plants 1-leaved; floral bracts 4-5 mm, almost as long as to slightly exceeding ovary.   19 P. nematocaulon
4 (1) Lateral lobes of lip filiform or linear, ca. 2 × as long as mid-lobe or much longer, spreading at right angles from axis of lip   (5)
+ Lateral lobes of lip oblong, triangular, ovate-triangular, or triangular-lanceolate, shorter than to subequal in length to mid-lobe, spreading at an acute angle to axis of lip   (9)
5 (4) Lip lacking a transverse ridge, not clearly demarcated into a hypochile and epichile, deeply 3-lobed near base   (6)
+ Lip divided near base by a transverse ridge into a short, concave hypochile and a longer, deflexed, deeply 3-lobed epichile   (7)
6 (5) Lateral sepals spreading; lip with a large, subglobose callus near base; spur saccate-ovoid, neck contracted, ca. 2 mm.   4 P. formosanus
+ Lateral sepals reflexed; lip ecallose; spur cylindric-clavate, ca. 3.5 mm.   5 P. jinchuanicus
7 (5) Lateral lobes of lip linear, 4-7 mm, 2-3 × as long as mid-lobe.   3 P. densus
+ Lateral lobes of lip filiform, 8-18 mm, 4-6 × as long as mid-lobe   (8)
8 (7) Spur fusiform, 3-5 mm.   2 P. calcaratus
+ Spur globose-saccate, 1-2.5 mm.   1 P. tentaculatus
9 (4) Lip with a large, subglobose callus near base   (10)
+ Lip ecallose   (12)
10 (9) Ovary 7-10 mm; dorsal sepal 2.8-3.5 mm; lip 3.5-4.2 mm; spur ovoid, apex acute.   14 P. lacertifer
+ Ovary 4-5 mm; dorsal sepal 2-2.5 mm; lip 2-3 mm; spur globose or saccate, apex obtuse   (11)
11 (10) Flowers white or pale whitish green; callus on lip glabrous.   15 P. coeloceras
+ Flowers green; callus on lip papillose.   16 P. neotineoides
12 (9) Plants 1-leaved.   6 P. fallax
+ Plants 2-6-leaved   (13)
13 (12) Leaves linear, to 0.6 cm wide   (14)
+ Leaves elliptic-lanceolate, elliptic, oblong-elliptic, ovate-lanceolate, or ovate, 0.8-6.5 cm wide   (15)
14 (13) Petals ca. 3.5 mm; lip 3-4.5 mm; spur cylindric, curved forward, 4-6 mm, almost as long as ovary.   7 P. bulleyi
+ Petals 2-2.5 mm; lip 2-2.5 mm; spur scrotiform, 1-1.5 mm, much shorter than ovary.   8 P. mannii
15 (13) Petals and lip pure white; dorsal sepal 7-9 mm; lip 9-11 mm.   9 P. constrictus
+ Petals and lip green, yellowish green, or creamy white; dorsal sepal 2-5.5 mm; lip 2.5-6 mm   (16)
16 (15) Plants usually robust; lip shallowly 3-lobed toward apex, 3.5-4 mm wide, disk with a dark, triangular nectary toward base.   10 P. goodyeroides
+ Plants slender to somewhat robust; lip 3-lobed near middle, 1-2 mm wide, disk lacking a nectary   (17)
17 (16) Petals and lip creamy white; lip base concave-saccate, papillose in front of spur mouth.   11 P. affinis
+ Petals and lip green to yellowish green; lip base shallowly concave, glabrous   (18)
18 (17) Leaves narrowly elliptic-lanceolate, 0.8-2 cm wide; floral bracts 5-8 mm, almost as long as ovary; lip ca. 3 mm; spur ca. 1 mm.   12 P. elisabethae
+ Leaves elliptic-lanceolate to ovate, 2-3.5 cm wide; floral bracts 8-12 mm, exceeding ovary (and sometimes flowers); lip 4-5.5 mm; spur 1.8-2.5 mm.   13 P. parishii

  • List of lower taxa


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