rahjcoseris. COMPOSITyE. 432 



the middle ; the others much shorter and less plumose or often quite naked. — A 

 single species. 



1. A. acaule, Torr. & Gray. A low, bnt show}^, stemless winter-annual, gla- 

 brous at maturity, although when young with some white-woolliness, which fringes 

 the edges of the short and rosulate-tufted runcinate radical leaves : scapes a spaa°or 

 less high, naked : head proportionally large (an inch or more long) : corollas yellow. 

 — Torr. & Gray in Jour. Bost. Nat. Hist. Soc. v. Ill, t. 13 ; Eaton in Hot. King 

 Exp. 197. Pterostephamis runciiiatus, Kellogg in Proc. Calif. Acad. iii. 20, ii<'. 4, 

 badly characterized. 



Dry plains and hills, from Fort Tejon to tlie Colorado, and from Sierra Valley through Western 

 Nevada. First collected by Fremont. No doubt this is Dr. Kellogg's Plerosleplmnus, but it has 

 no such akenes as are described and rudely depicted. 



114. GLYPTOPLEURA, D. C. Eaton. 

 Head 8 - 1 8-flowered. Involucre cylindraceous, of 7 to 12 lanceolate thin-herba- 

 ceous and somewhat scarious-margined equal scales, which are united at base into a 

 cup and unchanged in fruit, subtended by a few loose calyculate scales or foliaceous 

 bracts. Eeceptacle flat, naked. Akenes narrowly oblong, mostly slightly incurved, 

 terete, not contracted at base nor hollowed at the insertion, with 5 thick and 

 rounded ribs or angles, which are obscurely rugose, but on their sides elegantly can- 

 cellate-sculptured, so as to present a row of pores in the narrow intervals ; above a 

 cup-shaped shoulder surrounds the base of a short and thick 5-ribbed beak or neck, 

 which is dilated at the apex into a pappus-bearing disk and hollow, at least at the 

 top. Pappus bright white, caducous, of very numerous and equal fine and hardly 

 scabrous capillary bristles in several series; the outermost falling separately, the 

 inner slightly cohering in a ring at base. — Small and depressed winter-annuals or 

 biennials (of the interior desert), glabrous, many-stemmed, forming flat tufts only 

 an inch or two high; the stems or simple branches terminated by sessile rather 

 large heads of rose-purple or white flowers ; the leaves runcinate and mostly with 

 margined petioles, thickish. — Eaton, Bot. King Exp. 207, t. 20 ; Benth. & Hook. 

 Gen. PI. ii. 523 ; Gray, Proc. Am. Acad. ix. 209. 



1 . Gr. marginata, Eaton, 1. c. Margins of the short and crowded lobes and 

 teeth of the leaves, or the whole of the obtuse teeth, white-scarious ; the uppermost 

 and the subtending spatulate bracts (which mostly equal the 1 5 - 1 8-flowered heads) 

 pectinately scarious-fringed : rays (always 1) small : akenes minutely cinereous, the 

 beak rather deeply cupped. 



Truckee Pass of the Virginia Mountains and elsewhere on the western borders of Nevada 

 ( IVatson, Lemmon) ; therefore probably within the line of the State. A curious and most inter- 

 esting little plant. Heads rather over half an inch long, hardly rising above tiie radical leaves : 

 involucre of about 12 scales. Akene 2 lines long, besides its beak of fully half a line in length. 



G. SETULOSA, Gray, of Utah (rulmrr), lias fewer flowers and scales, larger rays (apparejitly 

 white turning to pink), and smaller siilitiiiding bracts much shorter than the narrow heail ; these 

 and the leaves want the scarious margins ami slender fringes, which are represented, however, by 

 a slight calloiis edge and a few bristh-s on the lobes ; the akenes are (piite glabrous, and their 

 beak tubular to the base. 



115, CALYCOSERIS, Gray. 

 Head many-flowered. Involucre double, viz. of one or two series of equal lance- 

 olate principal scales, and several short and loose calyculate outer ones, all scarious- 

 margined. Eeceptacle flat : a persistent capillary bristle subtending each flower 



