422 Madieae 



subsessile, usually fasciculate-clustered; involucral bracts gla- 

 brous or glandular-hispidulous ; bracts of the receptacle slightly 

 united; pappus of the disk-achenes of 6-10 linear palese. (Hem- 

 izonia fasciculata T. & G.) 



Very common and general on the plains and lower hills. June-September. 



2. D. Wrightii (Gray) Greene. Slender, diffusely and widely 

 branching; the filiform branchlets terminating in a single head; 

 lower leaves laciniate-pinnatifid ; pappus of disk-achenes com- 

 posed of 8-9 firm distinct palese, laciniate at apex. 



Frequent in the interior valleys beyond our range. San Bernardino; 

 Riverside; Elsinore. It has also been reported from Catalina Island. 



3. B. Kelloggii Greene. Closely resembling the last in habit; 

 heads solitary, terminating the slender paniculate branches; 

 pappus of the tubular flowers united to near the lacerate sum- 

 mit. 



Apparently rare in southern California; known only from near Pasadena, 

 where it was recently collected in an old field by Joseph Grinnell. 



39. CALYCADENIA DC. 



Erect virgate or diffusely branching, more or less hir- 

 sute, or hispid annuals, with narrowly linear entire 

 leaves, all but the lowest alternate. Floral leaves usu- 

 ally subulate and often ending in a saucer-shaped gland. 

 Receptacle flat, the chaff herbaceous and only enclosing 

 the disk-flowers. Ray-flowers 1-5, white or yellow, ves- 

 pertine, palmately 3-lobed or parted. Ray-achenes 

 obovoid-triangular, the terminal areola low, nearly cen- 

 tral. Disk-achenes turbinate-quadrangular, the outer 

 fertile. Pappus chaffy. 



1. C. tenella (Nutt.) T. & G. Slender, paniculately diffusely 

 branched above, 1-5 dm. high, sparsely hirsute-pubescent; the 

 filiform branchlets minutely viscid-glandular ; leaves almost fili- 

 form, the margins involute, destitute of glands ; heads scattered ; 

 involucre cylindraceous-campanulate ; ray-flowers 3-5, 3-parted 

 to the slender tube, white or often tinged with rose ; ray-achenes 

 rugose, short-stipitate and abruptly rostellate-apiculate ; disk- 

 flowers 5, white, cleft into oblong-linear lobes ; their pappus of 

 4-5 lanceolate palese tapering into stout rough awns and as many 



