20 TEXAS RESEARCH FOUNDATION: CONTRIBUTIONS, VOLUME 5 
13. Corolla with papillose ring at base within; leaves at first 
pubescent beneath with fine rather silky closely 
appressed stellate hairs, or glabrous (Guatemala, 
Honduras, Nicaragua)........ 55. P. vulgata. 
13. Corolla glabrous at base within; leaves at first minutely 
stellate-lepidote beneath. 
14. Ovary minutely villous-tomentose apically and at 
base of style; petals up to 9 mm. long; stamens 
4-4.5 mm. site Rica).. : 
ae 06. P. ‘macrantha. 
14, Ovaty  fabrous, or upateely short villous apically 
and at base of style; petals about 7 mm. long; 
stamens 3-4 mm. long (Costa Rica, Panama) 
Pe a 57. P. glabra. 
8. Anthers and other floral parts orange-punctate; filaments sometimes 
subequaling anthers; ovary glabrous except for sparse hairs apically 
and at base of style (E] Salvador)........... 58. P. aurantiaca. 
7. Anthers usually small, often slender, commonly lanceolate, sometimes less 
than 1.5 mm. long, inconspicuously punctate, either concolorous, orange- 
punctate dorsally, or with scattered minute reddish or black glands; 
filaments usually slender, often longer than anthers, sometimes only 
subequaling anthers. 
15. Branchlets conspicuously scaly, the epidermis peeling transversely 
and irregularly (Chiapas, Guatemala)....... 59. P. tartarea. 
15. Branchlets not scaly. 
16. Ovary and basal half of style densely tomentose, the hairs usually 
matted. 
17. Panicles axillary and terminal, branched to base, the branches 
very slender; pedicels filiform, 5-9 mm. long; leaves small, 
less than 10 cm. long, 5 em. wide (Guatemala)............ 
a eS OT ee rn SU aa 60. P. tomentosa. 
17. Panicles axillary, pedunculate, the branches angled; peduncles 
of umbels and corymbs often greatly nines leaves large, 
up to 25 cm. long, 9 cm. wide. 
18. Pedicels short, stout, 3-6 mm. long; flowers 3-5 mm. long. 
19. Flowers about 3 mm. long at anthesis; sepals 0.5- 
0.75 mm. long; petals densely papillose-tomentose 
over entire inner surface; anthers up to 1.75 mm. 
long, concolorous or with one to several small 
black glands dorsally; leaves oblong-lanceolate or 
oblanceolate, the acumen acute (Guatemala)... . 
tg re eee Fe 61. P. Skutchat. 
19. Flowers 5 mm. long at anthesis; sepals 1-1.5 mm. long; 
petals with glabrous area above base on inner 
surface, papillose at base; anthers up to 2.5 mm. 
long, punctate dorsally and in lobes with small 
red-black glands; leaves obovate-elliptic, the acu- 
men obtuse (Chiapas)...... 62. P. latifolia. 
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