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. B. 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...........2.....-..---- ll. #. delicatulum 
6. Staminate receptacles often many-flowered, bracts with rather short 
thick acumens; leaf-serrations acute or subacute 12. H. glawcescens 
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. 
B: SCCINS « PIR DEOUGC 2-252. 02<. tee. ee.: Saree SIE eere tie 2A oh ace 13. EB. pulchellum 
3. At least the apex of the stem pubescent. 
4. Leaves 4- to 6-plinerved, lower side strongly auricled at base, very 
slightly or not overlaping costa; vein-anastomoses frequent, con- 
Spicuous On Upper SUIfACe.......--.-------c-neceeeecereeeeceeeceeeceeees 14. EB. acrophilum 
4. Leaves triplinerved, both sides acute at base or lower slightly auricled; 
anastomoses inconspicuous or wanting. 
5. Serrations small, 2 to 5 on a side, only the very smallest leaves entire 
or 2etoothed 2. 2:.:. 5 ee ee ethene s- ree 15. B. microphyllum 
5. Leaves entire or with a single subapical tooth on one or both sides. 
16. H#. oblanceolatum 
4. Leaves quite or almost penninerved, one side of base acute, other rounded, 
whole margin more numerously serrate.............-.....- 17. 2. philippinense 
4. Base of wider side of leaf obliquely projecting across petiole and semi- 
hastate toward mMaTTOWeY. SIGG 72... af oo ano: 22.202. o.senseere-nnne- 18. H. hastatwm 
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. EB. viridescens 
7. Stipules broader and less acute, 10 to 15 mm long. 
20. EH. banahaense 
6. Stem-apex and leaves pubescent or even scabrous. 
7. Stipules lanceolate, over 1 em long. 
8. Leaf-teeth acute, crowdeds.227,25:,...-....0-.........- 21. H. palawanense 
8. Leaf-teeth coarser, spreading, more widely separated. 
22, H. lagunense 
7. Stipules 3 to 6 mm JONg.......---bsceceecceeeeeeeee 28. H. 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. B. philippinense 
6. Cystoliths linear, conspicuous but hardly crowded, serrations shal- 
lower, more acute, wanting at base................-.+-2- 24. HB. scriptum 
4, Stems, margins and veins of under surface of leaves with abundant 
stingless bristles; leaves abruptly acuminate............ 25. HB. spinulosum 
