Streptoechites chinensis (Merr.), 2012

Middleton, David J. & Livshultz, Tatyana, 2012, Streptoechites gen. nov., a new genus of Asian Apocynaceae, Adansonia (3) 34 (2), pp. 365-375 : 370

Streptoechites chinensis (Merr.)

D.J.Middleton & Livsh., comb. nov. ( Fig. 2 )

Epigynum chinense Merr., Philippine Journal of Science 23: 262 (1923); Xu, Wageningen Agricultural University Papers 88 (6): 25 (1988). — Sindechites chinensis (Merr.) Markgr. & Tsiang, Sunyatsenia 3: 152 (1936); Kerr in Craib, Florae Siamensis Enumeratio 2: 471 (1939); Tsiang & P.T. Li., Flora Reipublicae Popularis Sinicae 63: 170 (1977); P.T.Li et al., Flora of China 16: 188 (1995); Middleton, Flora of Thailand 7: 135 (1999). — Cleghornia chinensis (Merr.) P.T.Li , Guihaia 4: 192 (1984).

TYPUS. — China, Hainan, Yik Tsok Mau, McClure 9710

(lecto-, A, designated by Middleton (2005); isolecto-,

A, BM, E, G, K, NY, P [P00495801], PNH, UC, US,

Z; Figs 2 ; 3 ).

DISTRIBUTION. — Hainan, Vietnam and Thailand.

Given its known distribution it is very likely also to

be in Laos ( Fig. 3 ).

REDESCRIPTION

Branchlets glabrous or sparsely puberulent. Leaves: petiole 2-3.4 mm long, glabrous to puberulent; blade papery, ovate, 2.4-7.7 × 1.1-3.4 cm, 1.6- 2.6 times as long as wide, apex acuminate, base rounded, few hairs on midrib beneath, 3-5 pairs of secondary veins strongly ascending, tertiary venation obscure. Inflorescence 2.5-5 cm long, glabrous or minutely puberulent; peduncle delicate, 0.8-2.6 cm long; pedicels 5-8 mm. Sepals ovate, 1.5-2 × 1-1.5 mm, apex acute; glabrous, ciliate; colleters present in axils. Corolla white; tube 9-15 mm long, 1.5 mm wide, outside puberulent at top of tube, pubescent around mouth and inside; lobes 2-3.5 mm long, pubescent outside. Stamens inserted at about half of corolla tube length from base; anthers 1.5-2.6 × 0.6-0.7 mm. Disk 0.7-1 mm high, more deeply divided either side of ovaries so almost 2-lobed. Ovaries c. 1 mm long, glabrous; style and style head 4.8-6.8 mm long. Fruits weakly torulose, 8.9-17 cm long, 2.5-5 mm wide, glabrous, style twisted in fruit. Seeds narrowly elliptic, somewhat elongated at coma end, 13-18 × 1.4-1.7 mm; coma 2.4- 3.4 cm long.

Figures

FIG. 2. — Streptoechites chinensis (Merr.) D.J.Middleton & Livsh., comb. nov.: A, habit; B, flower in bud; C, corolla dissection; D, fruit; E, seed. Drawn from Lau 1791 (P). Scale bars: A, 20 mm; B, C, 2 mm; D, 10 mm; E, 20 mm.

FIG. 3. — Distribution of Streptoechites chinensis (Merr.) D.J.Middleton & Livsh. comb. nov.