Rhodolaena

Schatz, George E., Lowry Ii, Porter P. & Wolf, Anne-Elizabeth, 2000, Endemic families of Madagascar. VI. A synoptic revision of Rhodolaena (Sarcolaenaceae), Adansonia (3) 22 (2), pp. 239-252: 241

publication ID

http://doi.org/10.5281/zenodo.4605922

persistent identifier

http://treatment.plazi.org/id/492D879D-FFEA-FFF1-FE5C-930CFB41F8AF

treatment provided by

Carolina

scientific name

Rhodolaena
status

 

Key to the species of Rhodolaena  

1. Young branches and midrib of blade below usually with dense golden indument, the trichomes ca. 0.5 mm long; stipules linear to narrowly triangular, persistent .......................................................... 5. R. humblotii  

1’. Young branches and midrib of blade below glabrous, or twigs with dense brownish indument, the trichomes less than 0.1 mm long; stipules triangular, caducous .................................................................................. 2

2. Leaves with a rounded apex (rarely acute) and usually emarginate, sometimes also with a tiny mucro ........ 3

2’. Leaves with an acute to acuminate apex .................................................................................................... 4

3. Twigs usually glabrescent, and often glaucescent; leaves strongly coriaceous, the largest blade usually greater than 7 cm long (rarely less); inner sepals coriaceous, (2-) 2.5-3.5 cm long .............................. 4. R. coriacea  

3’. Twigs with dense brownish indument; leaves chartaceous, the largest blade usually less than 6 cm long (rarely to 7 cm); inner sepals chartaceous, not exceeding 1.8 cm long ............................................ 3. R. bakeriana  

4. Leaves with secondary veins nearly perpendicular to the midvein (> 80°); involucre a distinct collar at anthesis; ovary densely golden tomentose; seeds with dense white indument ........................................ 6. R. leroyana  

4’. Leaves with secondary veins ascending (<70°); involucre mostly indistinct at anthesis; ovary subglabrous, or white puberulent to tomentose; seeds glabrous .......................................................................................... 5

5. Leaves drying olive green, with evident secondary veins on the glossy upper surface strongly ascending (<45° to the midvein), tertiary veins forming an open reticulated network; twigs lacking conspicuous raised lenticels; flowers solitary; fruit large, the valves 2-3.3 × 2-2.5 cm ...................................... 7. R. macrocarpa  

5’. Leaves drying maroon-brownish, the secondary veins usually obscure on the dull upper surface, ascending at a 60-70° angle to the midvein, tertiary veins forming a dense reticulated network; twigs often with distinctly raised rusty brown lenticels; flowers paired ................................................................................................ 6