142 



XCVIII. ACANTHACE.E (cLARKE). 



[ Imrleria. 



B. grandicalyx. 



B. (jrandicalyx, var. 



B. ramulosa. 



B. nyasensis. 



B. huxifolia. 



B. crassa. 

 B. longissima. 

 B. blepharoides. 



B. Marlothii. 

 B. acanthoides. 



Leaves many up to 1 in. in length. 



Leaves 2 in. long; posticous sepal spine- 

 toothed . . . . . .14. 



Leaves 1 in. long ; posticous sepal entire . 14. 

 Leaves 1 in. long ; posticous sepal spine- 

 toothed . . . . . . 15. -S. mucronata. 



Leaves (at least all the upper seen) scarcely 1 in. 

 long. 

 Posticous sepal spine-toothed. 



Posticous sepal 5 in. long, silky hairy 

 Posticous sepal f in. long, membranous, 

 veined ...... 



Posticous sepal hardly spinous. 

 Spines slender, glabrescent 

 Spines simply hairy ; leaves very thick and 

 hairy ...... 



Spines gland-hairy ; corolla-tube 4 in. long . 

 Racemes unilateral, several-flowered 

 ffBracts next a flower toothed or compound spines, 

 or toothed or pinnatifid leaves. Racemes 

 several-flowered, often many-flowered. 

 Posticous sepal not, or occasionally very sparingly, 

 spine-toothed. 

 Posticous sepal ^ in. broad, lanceolate 

 Posticous sepal ^ in. broad, ovate 

 Posticous sepal spine-toothed, papery, reticulate- 

 nervose. 

 Innovations and leaves stellate-hairy beneath 

 except in age. 

 Stems shortly hairy or finally glabrate. 



Leaves hardly 1 in. long ; posticous sepal 

 i in. wide ..... 



Leaves up to 2 in 



— I in. wide 

 Leaves 3 in. long, 



liths beneath ..... 



Stem with spreading white hairs y^-g in, long. 

 Stellate hairs none or very few. 

 Heads axillary, dense, subcapitate. 

 Posticous sepal 1^ in. long 

 Posticous sepal f in. long 

 Heads axillary, manifestly unilateral, racemose 

 Leaves less than 1 in. long, spine-tipped 

 Villous ; corolla-tube If in. . 

 Shortly caiiescent ; corolla-tube 1;^ in. 

 Leaves 3 in. long, and upwards. 



Posticous sepal scarcely -I in. wide, deeply 



spinous . . . . . 32. jB. elegans. 



Posticous sepal \ in. wide, shallowly 

 spine-toothed .... 



Heads terminal, short-cylindric, dense . 



long ; posticous sepal 

 with prominent cysto- 



33. 

 34. 



B. carruthersiana. 

 B. yiava. 



Series B. Spineless. Bracts and sepals entire or scarcely toothed. 



*SoMALiA. — Lower ovule in each cell minute or ; capsule 

 never having more than 2 seeds, small ovoid with 



