Jaumea. COMrOSIT.E. 371 



60. ACHYRACHiENA, Schaucr. 

 Ple.ad many-flowered, heterogaiuous, with G tu 10 very short pistillate and fertile 

 inconspicuous rays; the disk-ilowers also fertile. Involucre oblong-canipanulate ; 

 its scales lanceolate, as many as ray-flowers, flattish on the back below and each by 

 its infolded thin margins enclosing an akene, or one or two empty ones besides. 

 Ilecoptacle nearly Hat, chaffy at the margin and among some of the outer disk- 

 (lowcrs; the outennoat clinfV roHombliiig tlio scales of tlio involucre, the rest inoro 

 mombnuiaceous or scarious. J^iys very small, hanlly cxceoding tlio disk, ilio 

 palmatoly 3-cloft concave ligtilo barely exceeding its style and much shorter than 

 its slender tube : disk-corollas slender, 5-toothed. Akenes linear-cuneate or clavate, 

 somewhat obcompressed, or in the disk nearl}' terete, 10-ribbed, and with the alter- 

 nate or all the ribs tuberculate-scabrous at maturity ; those of the disk truncate at the 

 apex ; those of the ray rounded and with an epigynous protuberant areola ; the 

 former with a jjappus of about 10 silvery linear-oblong blunt scarioua scales in two 

 sei'ies, the 5 outer considerably sliorter than the alternate inner ones, which are as 

 long as the corolla. — A single (Californian) annual species, with narrow loaves, 

 only the lower opposite. 



1. A. mollis, Schauer, A span to a foot or so high, erect and mostly slender, 

 villous-pubescent and somewhat glandular or viscid : leavers long-linear, entire, or 

 the lower sparingly laciniate : heads solitary and peduncled, terminating the stem 

 or fastigiate branches, at most an inch long : flowers whitish or yellowish, the rays 

 turning brownish. — LejnJostephanus mach'oides, liartling. 



Common in fiolda and opon lo'w groinuls tln-ougli tlio woalorn nnd cciitnil jioitions of tlic Stnto. 

 Becoming conspicuous by the expansion of (lie iiapims when thy nml divergenco of the nkencs, 

 forming a globular silvery-chaffy head, somewhat resembling tliat of Thrift {Arnicria vuhjaris) : 

 tlie longer pappus a (piarter of an incli long ; the akene about the same length. 



Tribk VI. IIELENIOIDE^. 



Distinguished from Helianthoidece by the absonco of chaff on the receptacle, from 

 Anthemulea; by the herbaceous scales of the involucre, mostly larger ami longer 

 akenes, &c. : the pappus when present of chaffy scales, awns, or sometimes awn-liko 

 bristles, rarely of finer or capillary bristles, but then the herbage dotted with trans- 

 lucent oil-glands. — Belonging chi<^fly to the New World, and especially to "Western 

 Korth America. 



61. JAUMEA, Ters. 



Head raany-flowered, with pistillate rays, or rarely none ; the flowoi-s all fertile. 

 Involucre cylindraceous-campanulate or somewhat turbinate, composed of very broad 

 and imbricated scales, the outer shorter and fleshy. Eeceptacle naked, in the Cali- 

 fornian species conical. Corollas glabrous. Style-branches of the disk-flowers tippeil 

 with a very blunt short cone. Akenes all alike, linear, 10-nerved, more or less 

 angled. Pappus in S.American species chaffv, in ours none. — Herbs or slightly 

 woody |)lants, glabrous, with opposite nnd entir(> linear (livshy h-avcs. rontiati" at 

 base, nnd solitary middle-sized heads of yellow flowej-s, cui peiluncles somewhat 

 thickened at the apex and terminating the branches. — Benth. it Hook. Gen. PI. ii. 

 397; Gray, Proc. Am. Acad. ix. 194. Coinngi/ne, Less., DC. 



