MISCELI.ANEOUS SPECIFIC TYPES — IV. 155 



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Plant known only as collected at Mountain Springs, above 

 the Colorado Desert, San Diego Co., Calif., by G. R. Vasey, 



1880. 



PoROPHYi^LUM CAESIUM. SufFrutescent, tall, freely branched 

 above : leaves linear, short, spreading or recurved ; heads M 

 inch high, nearly cylindric ; bracts of involucre very firm, 

 even almost coriaceous, dark-colored underneath a dense coat 

 of bloom, glandular spots commonly wanting, when present 

 elliptic in 1 or 2 pairs and deeply sunken : achenes chestnut- 

 brown, strigose-hispid, crowned with a fuscous pappus shorter 

 than itself. 



Cajon Hills, southern California, 1 May, 1891, collected by 

 Geo. W. Dunn ; type in U. S. Herb. 



PoROPHYLi^uM I^EUCOSPERMUM. Nearly or quite herba- 

 ceous, densely and fastigiately branched from the base, a foot 

 high, leaves short, almost filiform : heads subcylindric, nearly 

 an inch high, the corollas and pappus exserted from the 

 involucre for nearly their whole length ; bracts pinkish under- 

 neath the ordinary light coating of bloom, most of them 

 marked by 2 pairs of elliptic gland-dots : achenes long, 

 slightly beaked, pale straw-color or nearly white, thinly his- 

 pidulous, crowned by a long pale pappus. 



Specimens from Vegas Valley, Lincoln Co., Nevada, col- 

 lected by Coville and Funston on the Death Valley Exped. 9 

 March, 1891. Well distinguished by its long heads and pale 

 achenes and pappus. 



PoROPHYi^LUM CONFERTUM. SufFrutescent and tall, the 

 flowering branches with narrowly linear spreading foliage and 

 ending in compactly corymbose clusters of narrow and few- 

 flowered heads: heads about /4 inch high, 5-flowered ; bracts 

 of involucre linear, greenish and nearly without bloom , marked 

 \ with 4 to 6 narrowly oblong gland-dots : achenes narrowly 



cylindric, thinly scaberulous. 



