OP ARTS AND SCIENCES. 195 



S. NEGLECTA, Torr. & Gray, Fl. Not identified with any older 

 species. 



S. TERU^-NovyE, ToiT. & Gray, Fl. Still insufficiently known. 



S. BooTTii, Hook., Torr. & Gray, Fl. S. juncea, DC, not Ait. — 

 Var. LuDOViCiANA, is a dubious form, with larger heads and leaves. 

 Var. BRACIIYPHTLLA, the »S'. brachijphylla, Cliapm. in Torr. & 

 Gray, Fl., is a remarkably small-leaved and usually rayless form of 

 Georgia and Florida, passing into the typical S. Boottii. 



S. ARGUTA, Ait., Muhl., Fursh, DC, &c. ; the S. Muhlenbergii^ Torr. 

 & Gray. See p. 180. S. verrucosa, Schrader, is probably the same, 

 but is known only by the figure. 



S. JUNCEA, Ait., &c. ^Sl ciliaris, Muhl. in Willd. S. arguta, Torr. 

 & Gray, Fl., not Ait. Name refers only to the inflorescence, which 

 reminded Solander of that of some species of Juncus. 



•»—-)—-)— Not maritime : leaves more or less triple-ribbed (of 

 which there are indications in the lower leaves of one or two 

 of the preceding species, and some of the following show it 

 obscurely). — TriplinervicE. 



++ At least the stem and mostly the bright green leaves smooth 

 and glabrous or nearly so, not cinereous or canescent : inflor- 

 escence (when well developed) secund in commonly spreading 

 racemiform clusters which are collected in a terminal com- 

 pound panicle : akenes more or less pubescent. 



== Leaves of firm texture, rather rigid, acute or acuminate, the 

 slender lateral ribs hardly seen in the upper cauline : bracts of 

 the involucre firm and broadish, all obtuse. 



S. MissouRiENsrs, Nutt., with syn. as in Torr. & Gray, Fl. — Var. 

 MONTANA. The low or dwarf mountain form, with panicle usually 

 compact, the heads sometimes hardly secund, the leaves mostly all 

 entire. This is the original *S'. Missouriensis, Nutt. Jour. Acad. vii. 

 32, from the "Upper branches of the Missouri," collected by 

 Wyeth, and it extends from Saskatchewan nearly to the Pacific. — 

 Var. EXTRARiA, is a robust and broad-leaved form, with larger 

 heads and more conspicuous rays ; of the Rocky Mountains in 

 Colorado and New Mexico. 



S. SnoRTir, Torr. & Gray. Formerly known only on the banks of 

 the Ohio, it has recently been detected in Northern Arkansas, by 

 Professor F. L. Harvey. 



S. Marsh ALLi, Eothrock, in Wheeler, Rep. vi. 146. S. Arizona. 



