268 Key to the System of 



Majority of leaves divided to about the middle ... 1227 

 1227. Dorsal and lateral angles of fruitlets unenlarged. 



Very small, nearly or quite glabrous ; leaves minute, 

 divided into three entire or somewhat crenulated lobes ; 

 umbels capitular, few-flowered, without any bracteal in- 

 volucre ; united fruitlets renate- orbicular, very small, 

 with three thinly prominent angles and on each side with 

 a solitary groove, wrinkled and foveolated between the 

 dorsal and lateral angles. H. capillaris. 



Dorsal and lateral angles of fruitlets prominently 

 margined. 



Very small, nearly glabrous ; leaves from rhomboid- to 

 cordate-orbicular, cleft into three entire or somewhat 

 crenulated lobes ; umbels capitular ; fruitlets with three 

 amply prominent angles, between all the angles wrinkled 

 and foveolated. H. medicagiiioides. 



DIDISCUS. 



1228. Tall. 



Usually much beset with scattered long spreading hairlets ; 

 leaves large, mostly basal, deeply divided into broadish 

 again incised lobes or segments ; flowers numerous in 

 each umbel, on conspicuous stalklets ; petals white ; 

 fruitlets either both or oftener only one developed, usually 

 granular-rough. D. pilosus. 



Dwarf 1229 



1229. Perennial. 



An alpine herb ; leaves all basal, in outline from ovate- to 

 roundish-rhomboidal, incised into a few bluntish lobes ; 

 petals white ; both fruitlets developed and smooth. 



D. lm.mi.lis. 



Annual 1230 



1230. Generally both fruitlets densely beset with ciliolate 



bristlets. 



A weak desert-herb, scantily beset with hairlets ; leaves 

 small, divided into few narrow lobes or segments ; flowers 

 several in the umbel, head-like crowded ; petals blue. 



D. cyanopetalus. 



