Micropus. COMPOSITyE. 



:J35 



28. ADENOCAULON, Hook. 

 Head discoid; the 4 to 7 marginal flowers pistillate; the 5 or 8 central ones 

 sterile by the abortion of the ovary and stigma; both kinds M'ith nearly similar open- 

 funnelform 4 - 5-Iobcd corolla. Involucre of 5 ovate herbaceous scales in a single 

 series, relloxed in fruit. lieceptacle Hat, naked. Anthers sagittate at base, not 

 tailed. Akenes oblong-club shaped, large, several times longer than the small in- 

 volucre, obscurely fow-ribbed, toward the summit beset with stipitate glands. Pap- 

 pus none. — Herbs with slender paniculately brniiching stems, altornQto and cordftto 

 or reniform thin leaves, which beneath are clothed with lloccose white wool (as well 

 as the stem), at least when young, long margined or winged petioles, and very small 



paniculate heads of whitish flowers ; the pedimcles beset with viscid glands. 



Hook. P.ot. :Misc. i. 119, t. 15, & Fl. i. 308; Torr. & Gray, Fl. ii. 94; Gray, Proc. 

 Am. Acad. viii. 053. 



1. A. bicolor, Hook. Peronnial, one to three feet high : leaves mostly dcltoid- 

 cor<lato and more or less angulate-lobed, very white-woolly beneath, green and early 

 glabrous above, 2 to 4 inches wide : upper part of the stem and especially the long 

 and slender peduncles beset with stalked glands : akenes a third of an inch long or 

 even more. 



Redwooils, from Santa Cruz Co., also in the higli Sierra Nevada, nortli to IJritisb Columbia, 

 thence east to Lake Superior. Leaves rarely somewhat lyrate hy a pair of small basal lobes. 

 There are one or perhai)s two nearly related species in Japan, MamUhuria, and the Himalayas, 

 and two in Chili. _ •' ' 



29. MICROPUS, Linn. 

 Head discoid, several-flowered; the pistillate flowers with filiform corolla forming 

 a single series, each wholly enclosed (except the branches of the style) in a con- 

 duplicately infolded and laterally much compressed very gibbous chafl" or scale, which 

 becomes firm-coriaceous or cartilaginous in fruit, and falls at maturity with the com- 

 l)letely enclosed akene, inclined at length to dehisce into two valves : the herma- 

 phrodite but storilo flowora, with 4-r)-toothe(l tubular corolla, few and naked in 

 tho centre. Involucro of few scarioua Bcalos. lJoco])taclo small and HJiort. Akene 

 obovato and gibbous, laterally compressed, smooth, its apex (bearing tho corolla and 

 style) lateral. Pappus none. — Low floccose-woolly annuals ; with entire leaves, 

 and the small heads in sessile clusters. — Benth. & Hook. Gen. ii. 297 (excl. § 3 

 & § 4) ; Gray, Proc. Am. Acad. viii. 651. 



The genus belongs to the warm -temperate region of the Old World, excepting the following 

 outlying but evidently indigenous species. 



1. M. Californicus, Fisch. & Meyer. Slendor, a span to a foot high, mostly 

 erect, simple or branched, with rather close-pressed Avhite wool: leaves linear: heads 

 in lateral and terminal clusters which are inclined to be spicate : fructiferous smles 

 very woolly, under the avooI smooth and even, half-ohrordate, and with a subulate 

 beak terminating in a somewhat dilated scarious apex : embryo nearly straight. 

 — M. {R/i>/nch(ifrpi.t) nnf/nstifolivi^, Nntt. 



Var. SUbvestitUS, Gray: a form with smaller friictifcrotis scales, clothed with 

 much less wool and that more ai)presse(l, so that the shape is distinctly seen: but it 

 seems to pass into tho ordinary condition. 



Onen grounds, rommon nearly throughout the length of the Slate, cxtiMuling to the islands 

 off Lower California ; also in Oregon. Tho variety from Arroyo Grande, tlie Contra Costa 

 range, &c. 



