426 XXXVI. HHAMNE^. \_Spyridmm. 



§1. Heads very small and few-flowered, sessile along the branches, with very minute 

 %cts. Leaves obcordate. 



bracts. 



Leaves 2 to 5 lines long, hoary oa botb sides ....:. L S. tridenfatnm. 

 Leaves 1 to 2 hues long, glabrous above, white underneath , . 2. 6'. dlvaricatum, 



§ 2. Heads several-flowered in cymes or compound heads, usually with one or more floral 

 ives. Leaves ohovate, ohcor date-ovate, or broadly oblong. 



leaves. 



Disk annular, or of 5 glands close upon the ovary or nearly so. 

 Flower-heads in cymes, except in some of the last species 

 where they are in compound heads. ' 



Leaves herbaceous, pubescent or glabrous above. 



Leaves obovate, obcordate, or cuueate, mostly 2 to 3 lines 



long, glabrous above, the veins not impressed ... 8. 5. serj>yUaceum 

 Leaves ovate, 3 to 6 hues or sometimes above 1 in. lonff 

 hoary or softly pubescent, or rarely glabrous above. 

 Disk very prominent, almost closing over the ovary . . 4. «. parvifoHum. 



Leaves coriaceous, glabrous and smooth above when full- 



grown. 



Leaves mostly 1 to U in. long, ovate, on rather long pe- 

 tioles. Heads nnmerous, in the cyme. Koral leaves 

 rare. I'iant generally cancsecat as alohulosum 



leaves mostly 4 to ? in., on short petioles. Cymes y^obulosun 



small, with 3 or 4 floral leaves. Tomentum rusty 

 or very white. ^ 



W^' tT^^^l ""^^^^ contracted at the base . . 7. & olovatiun. 

 Leaves oute, obtuse at the base ... q ^ Gunn^i 



Leaves rarely attaining 1 in. 



WrZf'f'f'''''^^^^ • 9- S. ^pathulalum 



l^eaves small, broad, much revolute, smooth above 



woolly underneath. 

 Leaves orbicular or obovate. Howcr-heads very 



villous 



/ 



LeaJr^vate o?„b'''t '• .,? "^'^--^g'^'t'-ons at thetop . IL S. corJalum. 

 l^eaves ovate or obovate, with raised reticulations above, 



Disk hnin/th?c^K ?i \ • *.. 12. S.ijJdelophyUum 



i^isK lining the calyx-tube above the ovary, with a thickened 



annular margin under the lobes. Flower-heads i^ compound 

 compact heads. Leaves under ^ iu m compouna 



Leaves obtuse at the base, often emarginate ... 135 rnariilifoHum 



gor;-, •••♦. 14. S. complicatum. 



Mal'ledT TeZtfiT/i- " V^ "" ''""P"''''^ ^^'^^s, usually ^ith one or more 

 revolute ""'' ^''''^'^-^^^ong, narrow-cnneate or Z-lolcd, the margins usuaUs 



^'°T';fenr"' ^^ '^^- "^^^ «f « distinct glands. 



^Ta"/crj '.'""' ."'r'. ^"^^^^^ Cy^es* much '" ^^ '''''''''^'''■^"'''"''- 

 Tomentum hoary or white* Cvmp,i'oTY.Vn% " / ,' , * * . IG, iS. villosu7n. 

 ■Flower-heads unitS into one' denTconrom^^ ' ' ^^^ S- ^<^"-forrm. 



Leaves shortly 2-lobcd. Disk dividing into distinct dands 

 Leaves cuneate, very pubescent . ^ '"''• 



Leaves linear, minutely tomentose or glabrous' ' * ' in c;;v; 

 Leaves entire. Disk undulate or entire " * ' ' ^^- ^- H^um. 



] 8. S. hahnaturinum 



Calyx glabrous, very small 



ndcrocepliulum 



