A REVISION OF THE OLD WORLD SPECIES OF YELLOZTA 



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Margin spinose. 



Leaves 15-22-5 cms. long, slightly- 

 hairy ; spinose beneath midrib ; 

 6-8 in tuft; perianth-segments 



2-5cms. long 24. V. Spekei. 



Leaves 30 cms. long, margin and under 

 surface finely spinosely ciliated, 

 perianth-segments 25 or more 



cms. long 25. V. hereroensis. 



**Perianth-segments more than 4 cms. long. 



A. Leaves glabrous. 



Leaves grass-like, 15-22-5 cms. long, 



margin finely serrate when young ; 



perianth-segments 5-5*6 cms. long . 26. V. Kirkii. 

 Leaves 30 cms. long, margin denticulate 



when voung ; perianth-segments 5- 



6 cms* long 27. V. splendent. 



B. Leaves pubescent. 



Leaves 125-20 cms. long ; perianth- 

 segments 4-5-5 cms. long 28. V. cequator talis. 



Series IV. Ovary glabrous. 



Leaves 10-20 cms. long ; perianth-segments 



1-5 cms. long 29. V. elegans. 



Leaves 3-7-5 cms. long ; perianth-segments 



•4 cms. long 29 c. var. minor. 



Doubtful Species. 



Leaves 15-21 cms. long, glabrous, scabrid on 



back ; flowers unknown 30. V. stenophylla. 



Key to Mascarene and Arabian Species. 

 Series II. Ovary covered with stiff hairs... 31. V. pinifolia. 

 Series III. Ovary rough, viscous, and glandular. 



A. Glands sessile. 



Margin bearing bristles. Leaves 5 cms. 



long, with tuft of white hairs in 



axil ; margin and keel covered with 



small ascending bristles 32. V. sessiliflora. 



Margin bearing numerous spines. Leaves 



15 cms. long, densely pubescent ... 33. V. spinulosa. 

 Margin denticulate when old. Leaves 



15 cms. long ; when young ciliated 



with numerous pale brown bristles ; 



pectinate 34. V. pectinata. 



Margin thickened and toothed. Leaves 



3 dms. long; very rigid and glabrous, 



midrib triquetrous beneath 35. V dasylirioides. 



