334 COMPOSIT.E. Amblyopappm. 



by the base of the corolla. — Proc. Am. Acad. xix. 28. Amauria ? dissecta. Gray, PI. Fendl. 

 104. Villanora chnjsanthemoides, Gray, Ph Wright, ii. 96. — Along mountain water-courses, 

 Colorado to S. Arizona; first coll. by Fremont. 



145. AMBLYOPAPPUS, Hook. & Am. ('A/x^Xvs, blunt, TraTTTro?, pap-. 

 pus.^ — -Jour. Bot. iii. 321 ; Benth. & Hook. Gen. ii. 40 G. Aromia, Nutt. Trans. 

 Am. Phil. Soc. vii. 395. Infantea, Remy, in Gay, Fl. Chil. iv. 257, t, 48. — 

 Low annual (of Chili, and Schkuhria pusilJa, Wedd., is perhaps a second species 

 in Bolivia), probably introduced into California. 



A. pusillus, Hook. & Arn. 1. c. A span or two high, nearly glabrous, balsamic-viscid, 

 paniculately or corymbosely branched, with small short-])eduncled heads t3rminating the 

 branches : leaves linear and alternate, entire or lower pinnately 3-5-parted and opposite : 

 involucre 2 lines high, equalling the yellowish flowers. — Aromia tenuifulia, Nutt. 1. c. In- 

 fantea Chilensis, Kemy, in Gay, 1. c. — Around San Diego, California, and southward. 

 (Chili.) 



146. SCHKtTHRIA, Roth. {Christian Schkuhr, of Wittenberg.) — 

 Slender and paniculately much branched annuals (Mexican and Andean), some- 

 what pubescent, never tomentose ; the small pedunculate heads of yellow (rarely 

 purplish) flowers terminating the branchlets : leaves alternate, or the lower 

 opposite, pinnately 3-7-parted or uppermost entire, the divisions and rhachis 

 filiform. Herbage sometimes minutely resinous-atomiferous and the leaves im- 

 pressed-punctate. — Roth, Catalecta Bot. i. 116 ; Cass. ; Less., &c. Tetracarpum, 

 Moench, Meth. Suppl. 241. Schkuhria »& Hopkirkia, DC. Prodr. v. 654, 660. 

 Schkuhria, Benth. & Hook. Gen. ii. 403, in part, excl. Achyropappus, «&c. — Our 

 species, and S. WisUzeni of Northern Mexico, form a section (the genus Hop- 

 kirkia, DC), with leaves more commonly only 3-parted and on the branches 

 entire, heads only 3-5-flowered, with a single ray-flower or none: obpyramidal 

 akenes in length only about double the width of the summit, their angles very 

 densely long-villous, some hairs also on the faces : scarious tips of involucral 

 bracts purple-tinged : stems diffusely corymbose-paniculate. 



S. Hopkirkia, Gray. Pappus equalling the corolla; its paleie all alike, ovate-oblong, with 



percurrent costa projecting as a cusp: faces of the akene conspicuously 3-nerved. — PI. 



Wright, ii. 94. Hopkirkia anthemidea, DC. Prodr. v. 660. — S. Arizona, Wrig/tt, Lemmon. 



(Northern Mex., Hienke.) *■ 



S. W^rightii, Gray, 1. c. Pappus shorter than the corolla; its palea; all obovate and obtuse 



or erose-truncate, destitute of costa, merely thickened at very base : akenes rather less thick 



and faces less striate. — S. Arizona, Wriylit, Thurber, Lemmon. 



147. HYMENOTHRIX, Gray. (From ^t/v, membrane, Opii, bristle, 

 the pappus a combination of awn and thin palea.) — Herbs of Arizona and 

 vicinity, glabrous or somewhat pubescent ; with probably annual or perhaps per- 

 ennial root, branching stems of 1 to 3 feet high, alternate leaves once to thrice 

 parted into linear divisions or lobes, and numerous corymbosely cymose heads 

 (al)out one-third inch high) ; the corollas yellow or white and purple, strikingly 

 different in the two species. 



H. "Wislizeni, Gray. Glabrous : lo1)es of the leaves often spatnlate-linear and broadish : 

 heads radiate : involucre of comparatively narrow acutish and yellow-tinged bracts, hardly 

 any accessory ones : corollas yellow ; those of the disk with oblong lobes only half the length 

 of the narrowly obconical throat: style-tips pointless: akenes rather slender, barely pubes- 

 cent: pappus-awns narrowly margined below, naked and hispidulous above. — PI. Fendl. 



