Hoya bonii Costantin 1912

Type description:

In Flore General des Indo-Chine 4 (1912) 125.  22  H. H. LeConte H. Bonii Cost., n. sp.
Tige cylindrique de 3 mm. de diametre, a lenticelles arrondies.  Feuilles charnues, opposees, arrondies on en coeur a  base, terminees par un apicule aigu, parfois ovales ou meme oblongues, aigues au sommet, poilues en dessous, a poils courts et espaces, visibles a la loupe seulement, a peu pres glabres en dessus;  nervure mediane, tres saillante en dessous et poilue      sur les cotes; nervures secondaries 5-6 paires, obliques a 45 º, se ramifiant a quelque distance du bord ; 1imbe long de 8 - 10 cm. sur 3.8-7 cm.; petiole long de I cm., epais de 4 mm. inflorescence axilaire en ombelle;  pedoncule cylindrique glabre, vigoureux, long de 4-5 cm. large de 2 mm., a cicatrices qui se mu1tiplient au sommet sur une tete cylindrique;  pedicelles groupes tout autour en boule, allonges, nombreux, a poils longs de 2 cm.; fleurs de 12-14 mm., etaltees en etoile, violacees, fortement pubescentes en dedans. - calice a sepales cilies au bord, bruns en dehors, triangulaires, aigus, a extremite un per arrondie, a poils jaunatres.  Corolle glabre en dehors, tres poilue en dedans; lobes triangulaires, tres cilies au bord.  Coronule en etoile, egalant le tube de la corolle; dents 5, tres aigues, concaves en dessus avec des cotes dans la cavite par dessiccation, horizontales.
Tonkin: Mt. Vo-xa (Bon).

Translation: Stalk cylindrical to 3 mm. in diameter bearing lenticels. Leaves fleshy, opposite, round or heart shaped at the base end with the apex pointed, occasionally oval or even oblong and pointed at apex. Some hairs below, short and with intervals between the hairs visible, often seen with magnifying glass only; hairless and smooth above. Midrib very projecting below and hairy along its sides; secondary nerves 5 to 6 pairs, slanting at 45º for some distance towards the edge.  Leaf 8 to 10 cm. long. by 3.8 to 7 cm. wide; petiole to 1 cm., 4mm. thick.  Inflorescence in axillary umbels; peduncles cylindric, smooth, sturdy 4 to 5 cm. long, 2 mm. wide with scars from spent blooms at the apex; pedicels grouped, numerous to 2 cm long; flowers 12 to 14 mm., displayed like stars, purple, strongly pubescent inside. Calyx sepals with hairs along the edges, brown, triangular, pointed at the  tips or a little rounded, hairs yellowish.  Corolla glabrous on the outside and very hairy on he inside; lobes triangular, very ciliate on the edges. Corona star equal to the tube of the corolla, 5 pronged, very pointed, concave above with the sides drawn about forming a hollow, horizontal.
Tonkin: Mt. Vo-xa (Bon) Native name: Tu cu
Hairs of pedicels dull grey. Leaves from 6 - 9 cm.,  or more by 3 - 3.8 cm., or more.