Hemizonia. COMPOSITE. 365 



beak ; disk-akenes obscurely hairy, their pappus of 4 or 5 lanceolate firm-chaffy 

 scales tapering into stout rough awns, and of as many intermediate short truncate 

 and lacerate scales. Proc. Am. Acad. ix. 191. Osmadenia tenella, Nutt. Calyca- 

 denia tenella, Torr. & Gray. 



Southern part of the State, especially around San Diego. Heads 3 or 4 lines long. Some of 

 the disk-akenes are perfectly fertile. 



-{- Jr- Disk-shaped or saucer-shaped short-stalked gland terminating the fascicled leaves 

 and bracts : ray-akenes not apiculate at either end, the terminal areola depressed, 

 the surface smooth and even : flowers apparently white. 



1 3. H. Fremontii, Gray. A span high, with ascending branches, slightly hir- 

 sute or hispid : leaves narrowly linear, roughish : heads several-brae ted, terminal 

 and axillary, short-peduncled or nearly sessile, campanulate : rays 5 to 7, 3-parted, 

 their tube very short ; disk-flowers about 20 : chaff of the receptacle forming a 

 12- 14-toothed cup: pappus of disk-akenes 10 chaffy scales, at least the alternate 

 ones longer and subulate-awned, not longer than the akene. Calycadenia Fremontii, 

 Gray, Bot. Mex. Bound. 100. 



California, Fremont. The particular station unknown. 



14. H. pauciflora, Gray. About a foot high, with filiform diverging often 

 zigzag branches, minutely scabrous, sparingly hispid, especially along the margins 

 of the lower portion of the linear-filiform leaves : heads distant and sessile in the 

 axils along the branches as well as terminal, cylindrical : ray solitary, 3-parted down 

 to its short tube ; disk-flowers 3 combined into a 3-toothed tubular cup, their pappus 

 of 5 subulate-awned and 5 small intermediate truncate chaffy scales. Calycadenia 

 pauciflora, Gray, 1. c. 



California, Fremont : the station unknown. Both species were collected in 1846, and have not 

 since been met with. 



* * Virgate; the stem or branches strict: heads mostly in the axils, either solitary or 



~ clustered : rays deeply 3-lobed or sometimes 3-parted ; their akenes with truncate 



summit slightly if at all apiculate : disk-corollas narrow and long, 5-tootked : 



flowers in some and perhaps all the species open only through evening and 



morning. 



+- Soft-pubescent, not at all hispid : heads somewhat paniculate or in short-peduncled 



axillary clusters. 



15. H. mollis, Gray. About 2 feet high, grayish with a soft fine pubescence, 

 not even hirsute except on the margins of the uppermost leaves and bracts : these 

 tipped with a tack-shaped or saucer-shaped and short-stalked gland, or sparsely 

 beset with similar glands : flowers white ; rays 3 to 5, almost equally 3-parted and 

 with short but slender tube; disk-flowers 5 to 10 : chaff of the receptacle united 

 into a 6 - 8-toothed cup : ray-akenes somewhat rugose, and the broad terminal 

 areola rather protuberant : pappus in the disk of 5 or 6 subulate-awned scales nearly 

 twice the length of the akenes, and of one or two additional short and blunt scales. 



-H. angustifolia, Durand, PL Herm., Pacif. R. Eep. iii. 10, not of DC. Caly- 

 cidenia mollis, Gray, Proc. Am. Acad. vii. 360. 



Foot-hills, Mariposa and Fresno Counties ; very common at White and Hatch's, Bolander, 

 Gray. 



+- -{- Glabrous and smooth, or some of the lower leaves slightly and sparsely hispid : 

 heads scattered, solitary in the axils and terminal. 



1 6. H. truncata, Gray. Slender, a foot or two high ; the virgate stem some- 

 times paniculately branched above : leaves very narrowly linear, the short upper- 

 most and the bracts tipped with a very large and almost sessile saucer-shaped 

 gland: flowers yellow; rays 5 to 8, 3-cleft, with very short tube; disk-flowers 10 



