Premna. 107 



b. Corolla-tube 0.25— 0.3 cM.jcalyx 0.1—0.15 cM. ; stigmatic 

 lobes long, subulate 46. 



46. a. Leaves membranous, 6V2 — 15 by 5 — 12 cM.; teeth of 



the calyx subobtuse, often not alternating with the 

 corolla-lobes .... 31. P. membranacea p. 132. 

 b. Leaves chartaceous or coriaceous, 12 — 26 by 7 — 9 cM.; 

 teeth of the calyx acute, alternating with the corolla- 

 lobes 32. P. rotundifolia p. 132. 



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 towards the apex 51. 



49. a. Leaves membranous, coarsely undulate-dentate, sessile, 



10—14 by 5—8 cM.; corymbs 2—3 cM. long, I'/a— 2 cM. 



in diam 33. P. sessilifolia p. 133. 



b. Leaves chartaceous or coriaceous, petioled, corymbs 

 larger 50. 



50. a. Base of leaves decurrent, margins coarsely crenate; 



corolla-tube 0.45—0.55 cM. long, 0.1— 0.15 cM. in diam.; 



teeth of calyx large, acute 34. P. angustiflora p. 134. 



b. Base of leaves cordate or subcordate, margins dentate; 



calyx 2— 2V2 cM.(!?) ... 35. P. litter alis p. 135. 



51. a. Leaves 3—10 by 2V2— 5 cM.; petioles 1—4 cM. . 52. 

 b. Leaves 10—27 by 5—15 cM.; petioles I'/a— 8 cM. . 55. 



52. a. Corolla 0.3—0.4 cM 53. 



b. Corolla 0.6—0.7 cM 54. 



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



3-lobed, midlobe rounded, lateral lobes subacute, deltoid 



36. P. benguetensis p. 136. 

 b. Upper lip of corolla entire ... 21. 



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



usually longer than 10 cM. 37. P. flavescens p. 136. 



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



shorter than 10 cM. . . 38. P. membranifolia p. 137. 



55. a. Corymbs 5—8 cM. in diam 56. 



