RHODODENDRON AND SUBSECTIONS

SUBGENUS RHODODENDRON AND SUBSECTIONS OF SECTION SCHISTANTHE

1. Seeds with a distinct tail at each end............... 2

1. Seeds without distinct tails....................... 5

2. Capsule valves twisting after dehiscence; scales variously incised or sometimes entire....................... 3

2. Capsule valves not twisting after dehiscence; scales entire to undulate.................................... 4

3. Scales sessile, very dense, very unequal in size, lobed, centre dark-coloured......................................... R. sect. Schistanthe subsect. Malayovireya

3. Scales sessile or stalked, sparse to very dense, subequal in size, lobed to deeply incised (or sometimes entire), centre not dark-coloured (very rarely mixed indumentum with scales of two types, and in R. heterolepis Danet the scales very unequal in size and rounded and sessile or deeply incised and stalked)..... R. sect. Schistanthe subsect. Euvireya

4. Corolla rotate­campanulate; staminal filaments glabrous proximally and distally and hairy in the middle region............... R. sect. Schistanthe subsect. Pseudovireya

4. Corolla tubular; staminal filaments glabrous or hairy from the base...... R. sect. Schistanthe subsect. Discovireya

5. Corolla campanulate to funnel-shaped or tubular; scales entire to crenulate............ R. sect. Rhododendron

5. Corolla salver-shaped; scales incised............................................ R. sect. Pogonanthum

Note — Rarely, species of sect. Schistanthe lack the long-

tailed seeds that are characteristic of the section, e.g., R. eri-

coides Low ex Hook. f. and R. eymae Sleumer.