OF ARTS AND SCIENCES. 193 



a form of Blephar {pappus scaler (var. subcalvus) occui'S, in which the 

 pappus both of the ray and disk is reduced to a mere vestige. The 

 style of the disk-flowers of that genus, however, is characteristic, but 

 the distinction between the Madiece and the Galinsoyece is evanescent. 



Latia Hook. & Ai-n,, Gray, PI. Feudl., with Oxyura DC. added 

 (as in the Genera Plantarum), is best disposed under three sections. 



The first, Madaroglossa, has the receptacle chaffy only at the margin 

 between the ray and the disk (if also among some of the outer flowers, 

 only inconstantly so) ; the stout bristles or slender awns of the pappus 

 long-plumose or villose (or within woolly) below the middle ; akenes 

 all narrow, those of the ray crowned with a protuberant and annular or 

 obscurely cupulate epigynous disk, sometimes imitating a coroniform 

 pappus (abnormally, they now and then bear rudiments of true pap- 

 pus) ; and all the species are beset with more or less copious dark stij)i- 

 tate glands among the hispid pubescence. The white-rayed species are 

 L. glandulosa Hook. & Arn. (with a Californian variety, rosea), known 

 by the crisped and interlaced wool on the mner side of the pappus- 

 bristles; and L. heterotricha Hook. & Arn., with the less copious 

 wool all straight, none of the interior crisped. L. carnosa Torr. & Gray 

 may also be referred to this section, its very short rays seeming to be 

 white, the pappus as in the preceding. The yellow-rayed species are 

 L. hieracioides Hook. & Arn., with very short rays ; L. gaillardioides 

 Hook. & Arn., and L. elegans Torr. & Gray, with ample rays, the latter 

 known by its pappus being similar to that of L. glandidosa. 



The second section, Gallichroa, is very like the yellow-rayed jjor- 

 tion of the first, except that the setae of the pappus (5 to 2b) are 

 naked ; in L. pentachcBta Gray, slender and smooth, sometimes reduced 

 to two or three, or even with no pajspus at all. At Forest Hill, 

 Placer Co., California, Dr. Bolander gathered specimens apparently 

 growing with this species and undistinguishable from it, except by the 

 pappus, which refers them to L. gaillardioides. Of L. platyglossa Gray, 

 there is a variety, hreviseta, with pappus very much shorter than the 

 corolla or achenium, collected near Los Angeles by Dr. Bigelow. 



The third section, Calliglossa, has chaff" to all the disk-flowers, obovate 

 or oblong akenes, the pappus of subulate awns or more dilated palese, or 

 none at all ; the scales of the involucre woolly or woolly-ciliate within 

 at the infolded portion ; and there are no stipitate glands. 



Its larger subdivision, with a pappus and a flat receptacle, contains 

 L. calUglossa Gray, with some marked varieties as to the awns of the 

 pappus, and L. Fremontii ( Calliachyris Torr. & Gray), with conspicu- 

 ously paleaceous pappus and some sparse long villi interposed or barely 

 VOL. I. 25 



