4 LXIII. STYL1DTE.T:. \St}jiu1inml 



Scape glabrous or with short, glaiidular hairs .... 27. 5. leptorhizum. 



Western species, Pereuuials with iirm leaves. 



Leaves linear-cuneate, thick and very ohtase. Panicle loosely 



thyrsoid, glandular-pubescent 28, S, assimile. 



Leaves oblanceolate to obovate, spathulatc, flat. Raceme simple 



or nearly so. 



Leaves pubescent. 



Stock proliferoas-hranchcd. Leaves under J in. long. 



Scapes short, few -flowered 29. 5. mpesfre. 



Leaves radical, \ to 1^. in. long. Raceme long. 



Leaves entire 30. S. spathulatum. 



Leaves toothed 31. '^. Barleei, 



Leaves hirsute with long hairs. Raceme long 32. S. lineatum. 



Leaves glabrous . ■ . . • . 33. S, glaticam. 



Series VL Diversifolise. — 'Perennials with tvfted or rosiilafe radical leai:es. Scapes 

 vnth 1, 2, 3, cr 4 whorls of linear leaves^ much smaller than the radical o/ies. Western 

 species. 



Radical leaves spathulate, under 2 in. "Whorl-leaves very small 

 and few. Raceme simple or nearly so. 



Leaves obscurely striate 34. S. amcenum. 



Leaves with marked sfrioe 35. S. slriaiiinf. 



Radical leaves obovatc-orbicular, thick. Whorl-leaves subulate . 36. S, diverslfolinm. 

 Radical leaves narrow-ppathulatc, 2 to 4 in. Whorl-leaves narrow. 



Panicle compact, thyrsoid , 37. S. articalaium* 



Radical leaves linear or oblanceolate. 



Whorls several * .... 38. /S. Brayionianum, 



Whorls 1 or 2, very minute 16. .9. luteum. 



Radical leaves linear subulate. Whorl-lcaves similar but smaller . 39. jS. diiiroides. 



Series VII. Verticillatse.— 5/^?W5 elongated^ simple or branched. Leaves all linear 

 in distant whorls^ without larger radical ones. Western species. 



Inflorescence glabrous or nearly so 40. S. scandevs. 



Inflorescence hirsute, with spreading hairs ..,*.«,. 41. iS'. verticillatum. 



Series YIII. Sparsifoli^. — U/ide?- shrubs or shrnls^ with linear spreading leaves 

 scattered along the branches and not collected in radical or terminal tufts. 



Western species. Branches covered with the adnate cartilaginous 



bases of the petioles 42. iS. glandalosum. 



Eastern species. Petioles without adnate bases * . 43. 6'. laricifoVmn, 



A - > # - # 4 « 



Series TX. Imbricatse. — Stems branching, slender but hard^ covered with small itf^'. 



species. 



Leaves with scarious margins. Flowers few, sessile within the last 



leaves. Bi-acts transparent. Corolla-tube short ..... 44. S. PreissH, 



Leaves with scarious margins.. Flowers in a short tenninal sessile 



spike or raceme. Bracts leaf-like. Corolla-tube exserted . . 45. S, imhrlcatum. 



Ixiavcs without scarious margins. Flowers few, in a pedunculate 



head or short raceme. Bracts leaf-like. Corolla4ubc short , 46. 5. adpressiun. 



* 



Sect. II. Witrangium. — Cajpsule linear or very narrow -ollong. 



Series X. Tenellse.— ^/(?7?6?^r annuals. Leaves small or thin^ alternate or scatter^ 

 the lower ones sometimes more crowded but not dlslinctlg ivfied or rosidate. 



^ 



Leaves Imear, chiefly in the lower part of the stc 

 small. 



Capsule 2 to 4 lines long. Western spedes. ' 

 Flowers nedicellate. 



Bracts very 



