NORTH AMERICAN FLORA 
Stipules mostly oblong, foliaceous, 10 mm. long or longer, 
usually obtuse. 
Leaves glabrous beneath or sparsely strigose. 
Leaves evidently petiolate. 
Leaves glabrous on the upper surface. 
Leaves setose-pilose on the upper surface. 
Leaves subsessile. 
Leaves densely soft-pilose beneath. 
Leaf-blades broadly ovate or ovate-oval, usually 
subcordate at the base; corolla-tube 12 mm. long 
or shorter. 
Leaf-blades elliptic or lance-elliptic, obtuse at the ~ 
base; corolla-tube 15 mm. long. 
II. LEUCOPHYLLAE 
Calyx-lobes foliaceous, 10-15 mm. long. 
Calyx-lobes not foliaceous, 6 mm. long or shorter. 
Inflorescence of numerous once bifid cymes arranged in a raceme, the 
flowers sessile, secund; stipules bidentate at the apex. 
Inflorescence capitate or cymose-paniculate, the flowers often pedi- 
cellate, not secund; stipules entire. 
Inflorescence capitate. 
Inflorescence cymose-paniculate. 
Calyx-lobes linear or oblanceolate, 3-6 mm. long. 
Calyx-lobes orbicular-oblong or ovate-deltoid, 0.5—2 mm. long. 
Leaves scabrous on the upper surface; corolla-tube 8—9 mm. 
long. 
Leaves glabrous on the upper surface; corolla-tube 12 mm. 
long. 
III. LANIFLORAE 
Corolla arachnoid-tomentose outside, sometimes only sparsely so. 
Leaves more or less tomentose beneath when young but soon glabrate. 
Lobes of the calyx longer than the hypanthium. 
Lobes of the calyx shorter than the hypanthium. 
Leaves densely and persistently tomentose beneath with a close, 
white or fulvous tomentum. 
Corolla-tube 12—15 mm. long. 
Secondary veins of the leaves obsolete; tomentum of the lower 
surface of the leaves white, very closely appressed. 
Secondary veins of the leaves prominent; tomentum loose, 
fulvous. 
Corolla-tube 4-10 mm. long. 
Leaves long-pilose beneath along the veins; corolla-tube 8-10 
mm. long. 
Leaves not pilose beneath; corolla-tube 4-8 mm. long. 
Corolla variously pubescent outside, but never tomentose. 
Leaves subsessile. 
Leaves conspicuously petiolate. 
Leaves densely pilose beneath with long, mostly spreading hairs. 
ieaes pe abtous beneath or sericeous, or sometimes appressed- 
pilose. 
Corolla-tube glabrous below, setose-pilose at the top; leaves 
sericeous beneath. 
Corolla-tube minutely strigose or pilose throughout; leaves 
glabrous or strigose beneath. : 
Panicles shorter than the leaves, partly axillary; leaves 
glabrous. 
Panicles longer than the leaves, all terminal; leaves strigose 
or pilose-strigillose beneath. 
Calyx-lobes dissimilar, one of them large and foliaceous. 
Calyx-lobes similar, none of them foliaceous. 
Hypanthium strigillose; leaves glabrous on the upper 
surface. 
Hypanthium pilose with spreading hairs; leaves ap- 
pressed-pilose on the upper surface. 
IV. CALycosaE 
Corolla glabrous outside. 
Stipules reniform, foliaceous, persistent; corolla-tube 11-12 mm. long. 
Stipules small, not foliaceous, deciduous; corolla-tube 12—16 mm. long. 
Corolla pubescent outside. 
Flowers few, mostly in 3-flowered cymes. 
Flowers numerous, not in 3-flowered cymes. 
Calyx-lobes 3 mm. long or shorter. 
Stipules triangular-subulate; flowers secund along the branches 
of the panicle; calyx-lobes 1-3 mm. long. 
10. 
11. 
12° 
13. 
14. 
1S), 
16. 
Wie 
18. 
iS). 
26. 
27 
28. 
29% 
30. 
31 
32 
33 
“oom 
by by 
Wy WR AD 
[VOLUME 32 
. intermedia. 
. Pittierti. 
. cordata. 
- amoenda, 
. Langlasset. 
. darienensts. 
Rekot. 
. leptodictya. 
. leucophylla. 
. aspera. 
. nitida. 
. septicidalis. 
. gracilis. 
. laniflora. 
. Bourgaei. 
. villosa. 
. buddleoides. 
. Thiemei. 
. rufescens. 
. stachyoidea. 
. heteranthera. 
. pansamalana. 
. capitellata. 
. secundi flora. 
. R. Galeottii. 
. R. Jurgenseni. 
. R. Deamii. 
34. R. secunda. 
