BKU'ISIl HIEUACIA. 69 



(whicli frequently gite the idea of distinct teeth get upon an other- 

 wise entire leaf), sub-glabrous involucres more or less constricted in 

 the middle and truncate at the base after flowering. 



H. tridentatum is usually destitute of root-leaves, but occasionally 

 produces a small rosette at or near the base of the stem. It does 

 not however (so far as I have observed) retain any rosette during 

 the winter months. Under cultivation it becomes extremely luxu- 

 riant, frequently 6 feet high, and forms a racemose corymb. 



b. APHYLLOPOD-ffi, 



Stem leafy, never forming persistent rosettes at the base. Inner 

 phyllaries more or less obtuse. 



* Florets minutely pilose or sul-glalrom at the tips. 



27. H. PBENAIfTHOIDES. Without root-leaves. Stem leafy, 

 hairy, with a spreading leafy branched eorymlose panicle. 

 Leaves reticulate and rather glaucous beneath, sub-den- 

 ticulate, hairy ; lower ones tapering into a clasping petiole ; 

 intermediate with an a/wriclei clasping lase; upper ones cor- 

 date, sessile. Peduncles short, densely fioccose and setose. 

 Imohicres cylindrical in bud, rather floocose, densely clothed 

 with black gland-tipped seta. Phyllaries few, obtuse : outer- 

 most small. Florets pilose at the tips. Styles with dark 

 hairs. 



H. prenamthoides. Fries, Symb. p. 160. Koch, Syn. p. 527. 

 E. B. t. 2235. Gren. &,Godr. p. 379. Bab. Man. Ed. 3, p. 198. 

 Hook. & Am. Ed. 7, p. 224. 



