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

14. Mussaenda hossei Craib, Beih. Bot. Centralbl. 28(2): 444, 457. 1911.

红毛玉叶金花 hong mao yu ye jin hua

Mussaenda rehderiana Hutchinson.

Shrubs, to 2 m tall; branches densely whitened, reddish, or brownish villosulous, tomentulose, or villous, terete, sometimes becoming glabrescent. Leaves opposite; petiole 0.5-3 mm, villosulous to villous; blade drying thickly papery, oblanceolate, oblong-oblanceolate, elliptic, lanceolate, or ovate, 3-14 × 1.5-4 cm, adaxially sparsely to densely pilosulous to villosulous, abaxially densely hirtellous, villosulous, or villous, base obtuse, subcordate, or rounded, apex acuminate or acute; secondary veins 8-10 pairs, tertiary venation not readily visible; stipules usually persistent, lanceolate to triangular, 5-7 × 2-3 mm, densely strigose, villosulous, or villous, entire or usually 2-lobed for up to 1/2, segments acute to acuminate. Inflorescence congested-cymose, densely tomentose to villous, pedunculate or sessile and 3(or 5)-partite; peduncle 1-5 cm; bracts lanceolate, narrowly triangular, or linear, 1-10 mm; pedicels to 1 mm. Flowers subsessile to shortly pedicellate, biology not noted. Calyx densely villosulous to hirtellous; hypanthium portion subellipsoid to oblanceoloid, 2-2.5 mm; lobes lanceolate to narrowly triangular, 2-2.2 mm, acute, with 2 lobes on 4-6 flowers of each inflorescence expanded into white calycophyll, blade elliptic to suborbicular, 2-5.5 × 2-4 cm, base cuneate to cordulate, stipe 12-15 mm, apex obtuse or rounded and shortly acuminate. Corolla orange-yellow, salverform, outside densely pilosulous, villosulous, or tomentulose; tube 20-26 mm; lobes suborbicular, 2.5-3 mm, obtuse then abruptly acuminate or acute. Berry oblong-ellipsoid, ca. 18 × 8 mm, calyx lobes persistent. Fl. Nov-Mar.

Forests; 600-1600 m. S Yunnan [Laos, Myanmar, Thailand, Vietnam].

In the protologue, Craib noted variation in density of the pubescence among the few specimens he studied; continuous variation in density and length of the trichomes is evident among the specimens collected since then.


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