Micropus. COMPOSITE. 335 



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 with nearly similar open- 

 funnelforni 4 - 5-lobed corolla. Involucre of 5 ovate herbaceous scales in a single 

 series, reflexed in fruit. Eeceptacle flat, naked. Anthers sagittate at base, not 

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

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

 pus none. Herbs with slender pariiculately branching stems, alternate and cordate 

 or reniform thin leaves, which beneath are clothed with floccose 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 peduncles beset with viscid glands. 

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

 Am. Acad. viii. 653. 



1. A. bicolor, Hook. Perennial, one to three feet high : leaves mostly deltoid- 

 cordate 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. 



Redwoods, from Santa Cruz Co., also in the high Sierra Nevada, north to British Columbia, 

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

 There are one or perhaps two nearly related species in Japan, Mandchuria, 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 chaff or scale, which 

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

 pletely enclosed akene, inclined at length to dehisce into two valves : the herma- 

 phrodite but sterile flowers, with 4 5-toothed tubular corolla, few and naked in 

 the centre. Involucre of few scarious scales. Receptacle small and short. Akene 

 obovate and gibbous, laterally compressed, smooth, its apex (bearing the 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. Calif ornicus, Fisch. & Meyer. Slender, a span to a foot high, mostly 

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

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

 very woolly, under the wool smooth and even, half-obcordate, and with a subulate 

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

 M. (Rhyncholepis) anr/ustifolius, I^utt. 



Var. subvestitus, Gray : a form with smaller fructiferous scales, clothed with 

 much less wool and that more appressed, so that the shape is distinctly seen : but it 

 seems to pass into the ordinary condition. 



Open grounds, common nearly throughout the length of the State, extending to the islands 

 off Lower California ; also in Oregon. The variety from Arroyo Grande, the Contra Costa 

 range, &c. 



