55 



rus of low growth was observed in the vicinity, but no speci- 

 mens collected, and it is pretty certainly the plant here de- 

 scribed. 



^ Trifoliuni tricliocalyx 



Annual, prostrate or decumbent, much branched: branches 

 either very short, 3-4cm, or 2-3dm. when growing in moist 

 places, slender, often purplish, glabrous below, more or less pu- 

 bescent above with spreading white hairs: stipules broad, folia- 

 ceous, about 5mm. across on large plants, setaceously laciniate: 

 leaflets obovate-cuneate, maximum size about icm. long, 7mm. 

 wide, truncate and usually retuse, spinulose dentate, slightly 

 ciliate, otherwise glabrous: prominently veined: heads on slen- 

 der peduncles of i-3cm., 1-4 flowered on small plants, hemis- 

 pherical and with numerous flowers on large plants: involucre 

 small, spreading, rather deeply cut into about fifteen lance- 

 acuminate divisions: calyx oblong or somewhat campanulate, 

 about 7mm. long, lo-striate, the lance-acuminate lobes longer 

 than the tube, densely pubescent with tangled or straight white 

 hairs: corollas pale purple, not equalling the calyx lobes. 



No. 6721, collected May 13, 1903, in sandy pine woods 

 about Pacific Grove, Montersy county, California. It is an in- 

 conspicuous plant owing to its small size, depressed habit, and 

 small, few-fiowered heads as it occurs in its usual habitat along 

 grass-grown roads and trails in the woods, but occasionally it is 

 found in moist places, when the branches eventually become 

 several decimeters in length. These large plants usually have 

 short, few and small fiowered branches at the base. It is related 

 to T. variegahtm in a general way, but very distinct from it and 

 the other species of that group on accoant of the densely villous 

 calyx. 



Titliymaliis creiiiilatus (Engelm.) 



Euphorbia crenitlata Engelm. Bot. Mex. Bound. 192. 1859. 

 Euphorbia leptocera Engelm.; Boiss. DC. Prodr. 15: Part 2, 

 143. 1862. 



