— 34 — 



43. a. Lobes of the corolla subequal, tube 0.1-0.3 c,M. 44 



b. Corolla 2-lipped, tube 0.2 c.M.; leaves long acuminate, often serrate towards 



the apex. . , 10. P. Curranii 



44. a. Corolla-tube as long as or shorter than the calyx, 0.1 c.M.; leaves obovate- 



oblong 23. P. oblongata 



b. Corolla-tube longer; 0.2 c.M. or more; leaves broader 45 



45. a. Corolla-tube 0.2 c.M.; calyx 0.1 c.M.; stigmatic lobes short, capitate; ovary 



pubescent and glandular at the top, . . . . 29. P. regularis 



b. Corolla-tube 0.25-0.3 c.M.; calyx 0.1-0.15 c.M,; stigmatic lobes long, subulate. 46 



46. a. Leaves membranous, 6' 'a-15 by 5-12 c.M,; teeth of the calyx subobtuse, o c ten 



not alternating with the corolla-lobes. . . 30. P. membranacea 

 b. Leaves chartaceous, 12-26 by 7-9 c.M.; teeth of the calyx acute, alternating 

 with the corolla-lobes \ . . 31. P. rotundifolia 



47. a. Leaves glabrous beneath, or pubescent only on the nerves or in their axils, 



or along the margin. , . . ' . ',. , ... . ' . .48 

 b. Leaves pubescent beneath .63 



48. a. Leaves crenate, serrate or undulate, except close near the base. . . .49 

 b. Leaves entire or minutely denticulate, sometimes crenate, serrate or dentate 



towarus the apex. 5i 



49. a. Leaves membranous, coarsely undulate-dentate, sessile, 10-14 by. 5-8 c.M.; 



corymbs 2-3 c.M. long, lV 2 -2 c.M. in diam. . . 32, P. sessilifolia 

 b. Leaves chartaceous or coriaceous, petioled, corymbs larger, . , . .50 



50. a. Base of leaves decurrent, margins coarsely crenate ; corolla tube 0.45-0.55 c.M. 



long, 0.1-0.15 c.M. in diam.; teeth of calyx large, acute, 33. P. angustiflora 

 b. Base of leaves cordate or subcordate, margins dentate; calyx 2-2'A 

 c.M. (!?) 34. P. littoralis 



51. a. Leaves 3-10 bij 2', 2 -5 c.M.; petioles 1-4 c.M. . . . . ., .52 



b. Leaves 10-27 bij 5-15 c.M.; petioles l'/ 2 -8 c.M. 55 



52. a. Corolla 0.3-0.4 c.M. . . . . . . . , ' . , . .53 



b. Corolla 0.6-0.7 c.M. . . . . . " 54 



53 a. Upper lip of corolla 2-lobed, lobes rounded; lower lip 3-lobed, midlobe 

 rounded, lateral lobes subacute, deltoid . . 35. P. benguetensis. 

 b. Upper lip of corolla entire. . . 22 



54. a. Upper lip of corolla entire or somewhat 2-lobed; leaves usually longer 



than 10 c.M .'. 36. P. flavescens. 



b. Upper lip of corolla deeply 2-lobed; leaves usually shorter than 

 10 c.M. 37. P. membranifolia. 



55. a. Corymbs 5-8 c.M. in diam . . . . . 56 



b. Corymbs 10-24 c.M. in diam 59 



56. a. Corolla 0.3 c.M. 38. P, parviflora. 



b. Corolla 0.5-C.7 c.M. 56a. 



56a. a. Corolla minutely pubescent without, 0.7; leaves 10-19 by 6-10 c.M.; petioles 

 1.5-4 c.M.; calyx 0.2 c.M. ... .... 39. P. nervosa. 



b. Corolla glabrous without. 0.5-0.6 c.M. . . . . . . . 57 



57. a. Throat of corolla glabrous or nearly so; leaves 10-18 by 6-12 c.M.; 



petioles 3-8 c.M 40. P. paulobarbata. 



b. Throat of corolla villous . . .• . . . . ... 58 



58. a. Leaves membranous; upper lip of corolla 2-lobed 37. P. membranifolia. 

 b. Leaves chartaceous; upper lip of corolla entire. 42. P. integrlifolia. 



59. a. Calyx deeply 2-lipped and toothed . 60 



b. Calyx hardly 2-lipped, subtruncate - .62 



60. a. Calyx deeply or distinctly 2-lipped 61 



b. Calyx with 5 subequal large teeth, one sometimes larger 51. P. tomentosa. 



a. Lower bracts leafy; base of leaves attenuate . . 41. P. wrayi. 



