102 Premna. 



4. a. Leaves small, 5 cM. long; petioles IV4 cM. 



2. P. Mariannarum p. 111. 

 b. Leaves larger, 8—28 cM. long; petioles 1.2—12 cM. 5. 



5. a. Corymbs small, T-/.^ cM. in diam.; calyx glabrous or 



nearly so; corolla-tube 0.5 cM., sparsely villous within 



3. P. cordifolia p. 111. 



b. Corymbs larger, 5 — 27 cM. in diam.; calyx pubescent, 



0.15—0.3 cM.; corolla-tube 0.3—0.45 cM., densely 



villous within 6. 



6. a. Leaves chartaceous; calyx sometimes pseudo-4-toothed; 



corolla-tube glabrous without; lobes subequal, pubescent 



and glandular without . . . 4. P. parasitica p. 112. 



b. Leaves membranous . 7. 



7. a. Corolla-tube pubescent without, when adult; lobes ime- 



qual; corymbs reaching 23 cM. in length and 20 cM. 



in diam 5. P- sterculifolia p. 113. 



b. Corolla-tube glabrous without; lobes subequal; corymbs 

 reaching 13 cM. in length and 11 cM. in diam. 



6. P. Ruttenii p. 114. 



8. a. Leaves coarsely crenate along the whole margin, except 



near the base; pubescent or subglabrate on both sides; 

 calyx usually deeply and acutely 3 — 5-toothed; corolla- 

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



34. P. angustiflora p. 134. 



b. Leaves entire or somewhat crenate towards the apex 



only; calyx with usually obtuse and short teeth, often 



2 only 9. 



9. a. Leaves subsessile; cymes im panicles of interrupted spikes 



1. P, Derryana p. 110. 

 b. Leaves petioled; cymes in corymbose panicles. . .10. 



10. a. Leaves with dnercous-white epidermis, glabrous, barbellate 



in the axils of the nerves beneath . 7, P. alba p. 115. 

 b. Leaves not white; glabrous or pubescent . . . .11. 



11. a. Lamina of leaves pubescent on one or on both sides 12. 

 b. Lamina of leaves glabrous on both sides, the nerves or 



their axils beneath often pubescent 15. 



12. a. Leaves entire; corymbs 10—23 cM. long, 9—25 cM. 



wide 13. 



