— 33 — 



26. a. Leaves coarsely crenate or serrate ......... 27 



b. Leaves entire or somewhat crenate or serrate towards the apex only . . 28 



27. a. Teeth of the calyx acute, large, as long as or longer than the tube; corolla 



villous within 33. P. angustiflora 



b. Calyx truncate or with 4 minute teeth; corolla glabrous within 19. P, cauliflora 



28. a. Calyx truncate or indistinctly 4-toothed 29 



b. Calyx very distinctly 4-toothed ■ . .3! 



29. a. Leaves 8-25 '/ 2 by 6-14 c.M.; petioles V/' 2 -3 c.M.; corymbs 8-26 c.M. long, 11-24 



c.M. in diam . 30 



b. Leaves 8-14 by 3-5 c.M.; petioles 1-2 c.M.; areolate beneath; corymbs reaching 

 10 c.M. in length and in diam 20. P. areolaia 



30. a. Calyx truncate; stigma very shortly bifid . . .21, P. Kunstleri 

 b. Calyx usually irregularly undulate; stigma long bifid; lobes capitate 



43. P. macrophylla 



31. a. Leaves glabrous on both sides, or pubescent only on the nerves or in their 



axils beneath 32 



b. Leaves pubescent on one or both sides 42 



32. a. Leaves 10-30 by 5-20 c.M,; petioles 1-8 c.M 33 



b. Leaves 3-10 by 2V 2 -5 (7) c.M.; petioles 0.5-3 c.M 39 



33. a. Leaf-apex gradually acuminate, base broadly cordate or rounded, widest be- 



neath the middle; calyx membranous, with 4 sharp teeth 22. P. adenosticta 

 b. Leaf-apex abruptly acuminate or acute, (sometimes gradually acuminate in 

 P. inteqrifolia); widest across the middle or above it; calyx usually 

 coriaceous. . 34 



34. a. Axils of the nerves usually barbellate beneath. . 42. P. integ rifolia 



b. Axils of the nerves not barbellate beneath, 35 



35. a. Corolla-tube as long as the calyx, 0.1-0.15 c.M,; leaves obovate-oblong 



23. P. oblongata 



b. Corolla-tube longer than the calyx, 0.1 c.M. or more exserted. . . .36 



36. a. Leaves 10-30 by 10-15 c.M.; petioles 2' ;2 -37 2 c.M; calyx 2-lipped, the lips 



entire or 2-toothed; corolla-tube 0.3 c.M., lobes pubescent and glandular, 



tube glabrous without 4. P. parasitica 



b. Leaves 8-17 by 3-12 c.M.; petioles 1-3 c.M.; calyx 4-toothed or subtruncate. 37 



37. a. Calyx distinctly acutely 4-toothed, not or indistinctly 4-ribbed, sparsely 



pubescent and glandular; leaves 10-17'/ 2 by 3-1 5 1 2 c.M.; petioles 1.5-2.3 

 c.M.; style with shortly bifid stigma . , . 24. P. trichostoma 

 b. Calyx often truncate or indistintly 4-toothed. teeth obtuse; subglabrous. 

 4-ribbed; leaves 8-14 by 3-5 c.M.; petioles 1-3 c.M.; stigma long bifid, 

 lobes 0.1 c.M 38 



38. a. Leaves areolate beneath 20. P. areolata 



b. Leaves not areolate beneath 25. P. Williamsii 



39. a. Calyx hardly 4-toothed or subtruncate; stigmatic lobes 0.1 c.M. . . .38 

 b. Calyx with large teeth, which are or >/ 2 of the tube ; stigmatic lobes shorter. 40 



40. a. Calyx coriaceous, teeth 4, obtuse, ciliate. . . 26. P. oblongifolia 

 b. Teeth of the calyx acute, sometimes subobtuse, not ciliate; one lip 2-toothed, 



the other 2-toothed or entire 41 



41. a, Calyx subquadrangular ; leaves 4-7</ 2 by 2-4 c.M., 6-7-ncrved; corymbs 4-12 



c.M. long; corolla with 4 subequal lobes . . . . 27. P. Ridleyi 

 b. Calyx not quadrangular; leaves 4-6-nerved and larger, or, if as large, then 

 4-nerved; corolla 2-lipped 22 



42. a. Leaves 4-10 by 2-4 c,M.; petioles l-2'/ 2 c.M.; ovate, base and apex acute 



28. P, rufidula ' 



b. Leaves 9-24 by 6 7 2 -14 c.M.; petioles 2-9 c.M. 43 



