PHILIPPINE URTICACEAE. 
511 
5. Upper surface of leaves with numerous evident cystoliths. 
6. Stems rather densely pubescent; upper surface of leaf channeled by 
principal veins; stipules lanceolate, aciculate.. 7. E. heterophyllum 
6.' Stems less densely pubescent; leaf-surfaces plane; stipules oblong 
to oblong-lanceolate, obtuse or apiculate ..... 8. E. cheirophyllum, 
5. Upper surface of leaves destitute of conspicuous cystoliths. 
6. Staminate receptacles rather few-flowered, bracts with slender acu- 
mens; leaf-serrations very obtuse 11. E . delicatulum 
6. Staminate receptacles often many-flowered, bracts with rather short 
thick acumens ; leaf-serrations acute or subacute 12. E. glances cens 
1. Staminate receptacles sessile or on short stout peduncles, unknown in several 
species; pistillate receptacles sessile or subsessile, except in E. whitfordii. 
■ 2. Plants weak, creeping. 
3. Stems glabrous :. 13. E. pulchellum 
3. At least the apex of the stem pubescent. 
4. Leaves 4- to 6-plinerved, lower side strongly aurieled at base, very 
slightly or not overlaping costa ; vein-anastomoses frequent, con- 
spicuous on upper surface 14. E. acrophilum 
4. Leaves triplinerved, both sides acute at base or lower slightly aurieled; 
anastomoses inconspicuous or wanting. 
5. Serrations small, 2 to 5 on a. side, only the very smallest leaves entire 
or 1 -toothed 15. E. microphyllum 
5. Leaves entire or with a single subapical tooth on one or both sides. 
16. E. oblanceolatum 
4. Leaves quite or almost penninerved, one side of base acute; other rounded, 
whole margin more numerously serrate...'. 17. E. philippinense 
4.. Base of wider side of leaf obliquely projecting across petiole and semi- 
hastate toward narrower side 18. E. hastatum 
2. Plants erect or suberect, stems usually more or less succulent, never woody. 
3. Outer bracts of staminate receptacles distinctly corniculate, spurs project- 
ing well beyond outline of bract. 
4. Plants unarmed; leaves gradually contracted into a slender acumen. 
5. Leaves very definitely triplinerved. 
6. Stems glabrous. 
7. Stipules linear-lanceolate, very acute, 4 to 7 mm long. 
19. E. viridescens 
7. Stipules broader and less acute, 10 to 15 mm long. 
20. E. bcmahaense 
6. Stem-apex and leaves pubescent or even scabrous. 
7. Stipules lanceolate, over 1 cm long. 
8. Leaf -teeth acute, crowded 21. E, palawanense 
8. Leaf-teeth coarser, spreading, more widely separated. 
22. E. lagunense 
7. Stipules 3 to 5 mm long 23. E. lanaense 
5. Leaves almost or quite penninerved. 
6. Cystoliths minute, inconspicuous except on veins of upper surface; 
whole leaf-margin with fairly deep obtuse teeth. 
17. E. philippinense 
6. Cystoliths linear, conspicuous but hardly crowded, serrations shal- 
lower, more acute, wanting at base 24. E. scriptum 
4. Stems, margins and veins of under surface of leaves with abundant 
stingless bristles; leaves abruptly acuminate 25. E. spinulosum 
