TABLE 1 in A new species, Hoya honglenae and the first report of H. acuminata and H. phuwuaensis (Apocynaceae, Asclepiadoideae) in the flora of Vietnam

TABLE 1. Morphological diagnostic characters of Hoya honglanea and morphologically similar species, H. phuwuaensis, H. caudata, and H. soidaoensis.
H. honglenaeH. phuwuaensisH. caudataH. soidaoensisLeaf blade marginEntire, straight or slightly undulateSlightly wrinkled, slightly undulate or revoluteStrongly wrinkled, recurved when dryEntire, straight (not revolute)Leaf blade adaxial surfaceDark green with irregular sparse small white and dirty purple brownish marksDark green, with large white blotches all over the surfaceDark green, with large white blotches all over the surfaceLight green, without white blotchesCorolla size and color6–7 mm in diam., yellow to pale yellow orange8–12 mm in diam., white11–12 mm in diam., white to white with light pink tint13–15 mm in diam., yellowish to pale yellowOuter angle of corona lobeDark purple; oblong conoid, distally up- curved, obtusePurple; narrowly ovoid, almost straight or slightly up- cured, round at apexPale pink to white; ovoid, not up-cured or slightly up-curved, round at apexWhite; narrowly ovoid, hardly up-curved with rounded apex;Anther appendagesOblong, truncate, 1–1.2 mm long, much longer than inner angle of corona lobeTriangular, acute, 0.8–1 mm long, little longer than inner angle of corona lobeLinear to lanceolate, acute, 2.2–3 mm long, much longer than inner angle of corona lobeLanceolate, acute, 1.7–2 mm long, much longer than inner angle of corona lobePollinia length in mm0.32–0.330.3–0.310.35–0.60.81–0.83