Jaumea. COMPOSITE. 371 



60. ACHYRACHJENA, Schauer. 



Head many-flowered, heterogamous, with 6 to 10 very short pistillate and fertile 

 inconspicuous rays ; the disk-flowers also fertile. Involucre oblong-campanulate ; 

 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. 

 Eeceptacle nearly flat, chaffy at the margin and among some of the outer disk- 

 flowers ; the outermost chaff resembling the scales of the involucre, the rest more 

 membranaceous or scarious. Eays very small, hardly exceeding the disk, the 

 palmately 3-cleft concave ligule 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 nearly 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 pappus of about 10 silvery linear-oblong blunt scarious scales in two 

 series, the 5 outer considerably shorter than the alternate inner ones, which are as^ 

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

 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 : leaves long-linear, entire, or 

 the lower sparingly laciniate : heads solitary and ped uncled, terminating the stem 

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

 turning brownish. LepidostepJianus madioides, Bartling. 



Common in fields and open low grounds through the western and central portions of the State. 

 Becoming conspicuous by the expansion of the pappus when dry and divergence of the akenes, 

 forming a globular silvery-chaffy head, somewhat resembling that of Thrift (Armeria vulgaris) : 

 the longer pappus a quarter of an inch long ; the akene about the same length. 



TRIBE VI. HELENTOIDILE. 



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

 Anthemidece by the herbaceous scales of the involucre, mostly larger and longer 

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

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

 lucent oil-glands. Belonging chiefly to the New World, and especially to Western 

 North America. 



61. JAUMEA, Pers. 



Head many-flowered, with pistillate rays, or rarely none ; the flowers all fertile. 

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

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

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

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

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

 woody plants, glabrous, with opposite and entire linear fleshy leaves, connate at 

 base, and solitary middle-sized heads of yellow flowers, on peduncles somewhat 

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

 397 ; Gray, Proc. Am. Acad. ix. 194. Coinogyne, Less., DC. 



