Blepharis.] 



XCVIII. ACANTHACE-E (cLARKe). 



95 



Leaves linear-oblong ; inmost calyx-segments 

 short ....... 



Bracteoles at least \ as long as the calyx, lanceolate, 

 l-nerved. 

 One-flowered branches solitary. 

 Corolla \ in. long. 

 Leaves not bristly. 



Herb. Leaves hairy or glabrate 

 Dense woody undershrub. Leaves small, 

 glabrate ...... 



Leaves scabrous with white stiff hairs 



Corolla 1 in. long 



One-flowered branches approximate or in heads 

 or strobilate. 

 Corolla blue. 



Spikes in loose heads. 



Two innermost calyx-segments short . 

 Two innermost calyx-segments long . 

 Spikes strobilate ; leaves linear, sometimes 



slightly toothed 



Spikes dense, compound, terminal ; flowers large 

 Corolla clear yellow . . . . • 



** Leaves prickly-spinous on the margins (see also 6. B. 

 affinis, 14. B. linaricBfoUa, 15. B. Aster acanthus, 

 in which the leaves are sometimes toothed). 

 Leaves in each pseudo- verticil 4, heteromorphic, the 

 outer pair (in the middle of the stem) often much 

 reduced, appearing as spinous stipules. 

 Leaves linear ; inflorescences of short heads . 

 Leaves broad-elliptic ; inflorescences strobilate 

 Leaves in decussate subequal pairs .... 



Leaves in each pseudo-verticil 4, not very unequal. 

 Ovary (and fruit) with a large horny obversely 

 mitriform cap ...... 



Ovary without a large cap. 

 Inflorescences strobilate. 



Leaves with spreading teeth ; spikes close 

 Leaves with forward-pointing teeth ; spikes 

 looser .....•• 



One-flowered branches in dense scorpiod com- 

 pound cymes ....•• 



One-flowered branches in numerous axillary sub- 

 capitate clusters. 



Corolla shaggy 



Corolla slightly hairy . . . • • 



One-flowered branches solitary or 2-4 approxi- 

 mated. 

 Spines 1-2 in. long, linear, stout, woody, 

 spinous ...... 



Spines i-| in. long. 



Leaves oblong-elliptic; 1-flowered branches 



mostly 2-4 together . . . • 



Leaves linear or linear oblong ; 1-flowered 



branches solitary . • • • 



One-flowered branches in dense heads 2-3 in. in 



diam • • 



7. B. Bainesii. 



8. B. molluginifolia. 



10. B.fruticulosa. 



9. B. setosa. 



11. B. ruwenzoriensis. 



12. B. pratptisis. 



13. B. Welwitschii. 



14. B. Unariafolia. 



15. B. Aster acanthus. 



16. B. Sol. 



17. B. Buchneri. 



18. B. chrysotricha. 



19. B. tetrasticha. 



20. B. ohmitrata, 



21. B. edulis. 



22. B. serrulata. 



24. B. panduriformis. 



25. B. acanthodioidet. 



26. B. longifolia. 



23. B. Noli-tne-tangere. 



27. B. diversispina. 

 29. B. pungens. 



28. B. grandis. 



