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FOC | Family List | FOC Vol. 19 | Rubiaceae | Lasianthus

4. Lasianthus biermannii King ex J. D. Hooker, Fl. Brit. India. 3: 190. 1880.

梗花粗叶木 geng hua cu ye mu

Shrubs, 2-5 m tall; branchlets sparsely pubescent to densely appressed pubescent to strigose, or subglabrous. Petiole 7-14 mm, pubescent to strigose; leaf blade membranous or papery, elliptic, elliptic-ovate, or elliptic-lanceolate, 8-20 × 3-5 cm, glabrous adaxially, sparsely pubescent to densely appressed pubescent on midrib, lateral veins, and nervules abaxially, base acute to obtuse or rounded, apex cuspidate-acuminate; lateral veins 5-7 pairs; nervules reticulate, slender and inconspicuous to parallel and conspicuously elevated abaxially; stipules triangular or lanceolate, 3-5 mm, pubescent to strigillose, apparently caducous. Inflorescences congested-cymose to subcapitate, densely strigillose, pedunculate; peduncles slender to robust, 5-15 mm; bracts linear, 2-10 mm. Flowers sessile or subsessile. Calyx purple when fresh, strigillose; hypanthium portion turbinate, 1-1.5 mm; limb 4-5 mm; lobes 4-6, narrowly lanceolate to oblanceolate, 2-4 mm. Corolla light purple when fresh, 7-8 mm, villous inside; tube 3-5 mm, glabrous outside; lobes 4-6, oblong-ovate, 3-4 mm, pilosulous outside. Fruit globose, 0.3-1.5 cm in diam., smooth or with ca. 5 ridges; pyrenes 5. Fl. Apr, Oct-Nov, fr. Jul.

Montane forests, shaded and wet places; 1000-2500 m. Guizhou, Hainan, Xizang, Yunnan [Bhutan, NE India, Myanmar].

The well-developed calyx lobes that are usually broadest near the apex are distinctive.

1 Branches usually sparsely pubescent or subglabrous and leaf nerves abaxially sparsely pubescent; nervules reticulate, slender and inconspicuous; calyx lobes relatively narrow and short; peduncles slender, longer or shorter than petioles.   4a subsp. biermannii
+ Branches and leaf nerves abaxially densely appressed strigose; leaf nervules parallel and conspicuously elevated abaxially; calyx lobes relatively wide and long; peduncles robust and usually longer than petioles.   4b subsp. crassipedunculatus

Lower Taxa


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