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SPECIES

Scientific name: Peliosanthes aperta Aver., N. Tanaka & Vuong
English name:
Vietnamese name: Huệ đá không cánh
Other name:

DESCRIPTION

Terrestrial rhizomatous perennial herb. Rhizome subterranean, plagiotropic, simple or with a few branches, 1.0–1.5(2.0) cm long, bearing many semi-woody, dull gray–brown wiry roots covered  densely  with  light  gray  root  hairs.  Stems  ascend-ing  to  erect,  about  5  mm  tall,  densely  covered  with  rem-nants of whitish scarious scales (cataphylls). The scaly leaves at  anthesis  ovate  to  oblong,  shortly  acuminate,  scarious  or papyraceous, conduplicate, distichous, proximally imbricate, loosely embracing base of peduncle, 0.5–2.0(3.0) cm long, (3)4–6(8) mm wide. Leaves suberect to arching, petiolate, to 35–45 cm tall; petiole rigid, slightly curved, (15)20–25(30) cm  long;  leaf  blade  narrowly  elliptic,  shortly  acuminate with  acute  apex,  entire  along  margins,  glabrous,  glossy, uniformly  green  on  both  sides,  (14)16–20(22)  cm  long, (3.0)3.5–4.0(4.5) cm wide; longitudinal veins many, promi-nent, crossed sub-perpendicularly with many dichotomously branching  transversal  veinlets.  Flowering  stem  (scape)  aris-ing axillary; peduncle and rachis white with dirty violet tint, distally bearing a sub-dense raceme; peduncle rather slender, straight, erect, (2.5)3.0–4.0(5.0) cm long, 1–2 mm in diam-eter,  bracteate;  the  sterile  bracts  (6)8–10(12),  triangular-ovate, cordate at base, slightly conduplicate, shortly attenuate or acuminate, whitish, scarious, (0.3)0.5–1.0(1.5) mm long and  (2.5)3.0–5.0(6.0)  mm  wide,  proximal  bracts  closely located  and  imbricate  at  the  peduncle  base;  rachis  loosely many-flowered,  finely  angled  longitudinally,  (5)6–10(12) cm long. Floral bracts 2, variable in size along rachis, proxi-mal ones much larger, diminishing upward, distally antrorse, white to light violet, scarious; bract located below flower, nar-rowly triangular, cordate at base, acuminate at apex, slightly concave, (2.0)3.5–4.5(5.0) mm long, (0.6)1.0–2.0(2.5) mm
wide;  bracteole  lateral  to  flower,  subsimilar  in  shape,  twice smaller, (0.8)1.0–1.5(1.8) mm long, (0.6)0.8(1.0) mm wide.

Flowers  solitary  in  bracteal  axil,  pedicellate,  broadly  open, (8.5)9.0–11.0(11.5)  mm  across,  horizontal  or  ascending; basal syntepalous part broadly obconical, 3.0–3.5 mm across, 1.5 mm long, jointed with a distinct articulation to a terete, horizontal  or  ascending  pedicel;  pedicel  (1.0)2.0–3.5(5.0) mm  long,  0.5–0.8  mm  in  diameter.  Perianth  segments  6, white, straightly spreading, blunt to rounded at apex, with entire,  sometimes  slightly  undulate,  not  revolute  margins, (3.0)3.5–4.0  mm  long;  outer  segments  narrowly  ovate (2.2)2.5(2.8) mm wide; the inner oblong, (1.8)2.0(2.2)wide. Corona  pure  white  or  yellowish,  annular,  slightly  incurved distally,  (2.6)2.8–3.2(3.5)  mm  across,  1.5  mm  high;  distal inner margin almost vertical, shallowly 6-lobed; orifice 2.0–2.5 mm in diameter. Anthers 6, sessile, introrse, inserted at distal  inner  margin  of  corona,  broadly  ovoid,  0.6–0.8  mm long and wide, light yellowish. Ovary half-inferior; free part hemispheric, 0.4–0.5 mm high, 1.5–1.8 mm across, at base almost orbicular or very obscurely 3-lobed in cross section, angulate longitudinally; the interior imperfectly partitioned into 3 chambers by 3 septa; each chamber slightly open with  narrow  longitudinal  slit  at  central  axial  portion  of  ovary,  containing 4 ovules on basal placenta; style conical, triangu-lar in cross section, 1.0–1.2 mm tall, 0.8 mm in diameter at base; stigma 3-partite, the lobes obovate, finely papillulate. Seeds narrowly ovoid to ovoid, 11–14 mm long, 7–9 mm in
diameter, dark glossy green.

Habitat and phenology

Terrestrial herb. Shady humid primary and secondary ever-green  broad-leaved  forests  on  granite  at  elevation  about
400 m a.s.l. Flowering in April–May. Occasional.

Expected  IUCN red list status: ‘Data Deficient’ (DD).


Distribution

Southern  Vietnam  (Khanh  Hoa  province,  Hon  Ba  Mountains). Endemic to southern Vietnam.

Ref: Nordic Journal of Botany, 34(1): 23-37

PHOTOS

SCIENTIFIC CLASSIFICATION
Kingdom: Plantae
Division: Magnoliophyta
Class: Liliopsida
Order: Liliales
Familia: Convallariaceae
Genus: Peliosanthes

PARAMETERS

BVN - BotanyVN - Botany Research and Development Group of Vietnam
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