Monadenium.] CXXU. EUPHORBIACE® (BROWN). 
Tubercles flattish, scarcely prominent - Ll. M. Lugarde. 
Tubercles very distinctly prominent. 
Leaves about as long as broad sy. - 2. UM, heteropodui. 
Leaves much longer than broad. 
Leaves up to 14 in. long, spathulate. 3. M. Schubei. 
Leaves 1-2 in. long, linear-lanceolate. 4. M. Guentheri. 
Tubercles 4-1 lin. long, without prickles 
under or around the leaf or leaf-sear; 
leaves }—} in. long . “ 5. MM. stapelioides, 
**Stems annual fr ont a per ennial rootstock or tuber, 
Plant with soft prickle-like processes on the 
peduncles and cymes. 
Peduncles 3-1 in. long ; bract-cup 3-4 lin, 
long, conspicuously reticulate . F . 7. M. echinulatum. 
Peduncles 13-33 in. long. 
Stem pubescent with short defiexed hairs ; 
involucre inrolled at the top margin . 8. VM. aculeolatum. 
Stem glabrous ; involucre slightly recurved 
at the top margin : 9. UM. asperrimum. 
Plant glabrous or pubescent, without prickle- like 
processes on any part of it. 
Cyme-peduncles 1-3 in. long. 
Leaves linear-lanceolate, 3—} in. broad, 
acutely toothed ; capsule with 2 very 
narrow wings along each angle. . 10. M. Getzet. 
Leaves subspathulate to suborbicular, 2-2 
in. broad, crisped or entire. 
Leaves 2-6 in. long; capsule without 
wings or crests along the angles . Al. MM. lave. 
Leaves 13-2} in. long; capsule with 2 
broad toothed wings along each angle 12. M. major. 
Cyme-peduncles 73-2 (in M. erubescens 
sometimes 1) in. long. 
Stem and leaves puberulous; bract-cup 
4-4in. long and as much or wore indiam. 13. M, erubescens. 
Stem and leaves (except in M. invenustum) 
glabrous. 
Cymes 4—5-times forked, with many in- 
volucres, compere or rather dense ; 
bract-cups 14-24 lin. long. 
Bract-cups deep sed or purple; in- 
voluere 2—24 lin. long, broadest 
below the middle é - 14. M. coccinewm. 
Bract-cups green or reddish- tinted ; 
involucre ]} lin. long, broadest just 
above the middle . : . 15. UM. parviflorum. 
Cymes at first with 1 involuere, finally 
once or twice forked with 3-7 in- 
volueres, often nodding. 
Involucre with 4 distinct crenations at 
the top margin; leaves linear- 
lanceolate . i . 21. M. crenatum. 
Involucre entire at the top margin. 
Bracts free to the base on both 
margins, 
