12. Mussaenda hainanensis Merrill, Lingnan Sci. J. 14: 58. 1935.
海南玉叶金花 hai nan yu ye jin hua
Climbing shrubs; branches terete, densely ferruginous- or gray villosulous to tomentulose. Leaves opposite; petiole 2-5 mm, densely velutinous to hirtellous; blade drying papery, adaxially dark green, abaxially pale, oblong-elliptic, obovate, or lanceolate, 3-12 × 1.5-4 cm, adaxially sparsely to densely villosulous to strigillose or hispid, abaxially densely villosulous or tomentulose, both surfaces with pubescence denser along principal veins, base cuneate to acute, apex acute to shortly acuminate; secondary veins 7 or 8 pairs, tertiary venation visible and reticulate; stipules persistent, triangular to ovate, 3-7 mm, densely pilosulous to villosulous, entire or usually deeply 2-lobed, lobes lanceolate to linear, acuminate. Inflorescence subcapitate to congested-cymose, 3-5 × 3-5 cm, densely pilosulous to villosulous, pedunculate or sessile and 3-partite; peduncle 1-3 cm; bracts linear-lanceolate, 3-6 mm. Flowers sessile or subsessile, biology not noted. Calyx densely strigose to sericeous or pilose; hypanthium portion ellipsoid to turbinate, 1.5-2 mm; lobes linear-lanceolate to narrowly elliptic, 6-8 mm, acute to acuminate, with 1 lobe on 1 or 2 flowers per inflorescence expanded into calycophyll, blade broadly elliptic to ovate, 1.5-4 × 1-3.5 cm, moderately to sparsely strigillose or sericeous, base obtuse, truncate, or cordulate, stipe 10-16 mm, apex acute. Corolla yellow, salverform, densely strigose outside; tube 20-25 mm; lobes triangular-ovate, 3-5 mm, adaxially densely yellow papillose, acuminate. Berry ellipsoid to ellipsoid-oblong, 18-20 × 11-12 mm, pilosulous to hirtellous, densely lenticellate, somewhat woody, with calyx limb deciduous, with pedicels sometimes elongating, to 4 mm. Fl. Mar-Jun, fr. Jul-Aug.
● Forests at middle elevations; 300-800 m. Hainan.
The protologue and H. H. Hsue and H. Wu (in FRPS 71(1): 297. 1999) described the "calyx tube" as 3-4 mm, but this has not been seen on specimens studied.