16 TEXAS RESEARCH FOUNDATION: CONTRIBUTIONS, VOLUME 5 
28. Anthers not barbate; leaf blades con- 
spicuously crenulate-serrulate, oblan- 
ceolate or lanceolate; ovary minutely 
and finely tomentose to middle; pubes- 
cence of branchlets tawny (Oaxaca) 
Nie Cis ee Cee: 28. P. oxyphylla. 
20. Ovary glabrous (species 29, 30, 43), or with scattered hairs apically, 
these hairs when present usually erect and stiff, sometimes 
pubescent apically as in P. rosea (also see species 20-28). 
29. Apex of leaves acutish or obtuse; ovules 12-16, partially 
biseriate; petals densely papillose-tomentose over entire 
inner surface (Cuba, Mexico, British Honduras, Guatemala) 
EPS Se ee Fe Gees oe 29. P. cubana. 
29. Apex of leaves acuminate or subabruptly acuminate; ovules 
4-12, strictly uniseriate; petals glabrous at base on inner 
surface, or thinly papillose in P. laza. 
30. Anthers epunctate dorsally; flowers very small, about 
3 mm. long, congested; ovules 10-12, minute; inflores- 
cences terminal or axillary; leaves drying pallid, sub- 
coriaceous (Chiapas)........... 30. P. subcoriacea. 
30. Anthers either orange or black-punctate dorsally; flowers 
3.5-7 mm. long; ovules 4-9; inflorescences strictly 
terminal; leaves not drying pallid, usually thin, sub- 
coriaceous only in P. hondurensis. 
31. Anthers strictly orange-punctate dorsally. 
32. The glandular area inconspicuous (Michoacan) 
Bi ee re Oke Ee a. 
32. The glandular area large, elevated (Venezuela) 
Ces) RS en ee aap 32. P. Agostiniana. 
31. Anthers conspicuously black-punctate dorsally ; some- 
times orange-punctate in P. lanceolata, the punctate 
area prominent. 
33. Flowers usually less than 4 mm. long at anthesis; 
stamens 2—2.75 mm. long. 
34. Anthers barbate apically; sepals about 1.2 
mm. long (Hispaniola, Cuba)............. 
RF Op ae pa 13. P. serrulata. 
34. Anthers not barbate; sepals less than 1 mm. 
long (Mexico and Central America). 
35. Filaments about 1 mm. long; pedicels less 
than 3 mm. long (Nicaragua)......... 
Sere ee 33. P. Rothschuhiana. 
35. Filaments 1-1.4 mm. long; pedicels us- 
ually 1-4, sometimes 6 mm. long. 
36. Anthers 1.8-2.2 mm. long, black- 
punctate dorsally; ovary pilose- 
tomentose apically (Veracruz)... . 
ee 22. P. oblongifolia. 
