132 Greene Revision of the Genus Wislizenia. 



near affinity for W. Palmeri. Its leaves are all trifoliolate. Its carpels 

 are short in comparison, and their terminal tubercles are spreading, not 

 convergent as in that; while by its unmistakably suffrutescent or even 

 fairly shrubby habit and duration, it stands alone in a genus all other 

 known species of which are annuals. 



8. Wislizenia Palmeri Gray. 

 Widizenia Palmeri, Gray, Proc. Am. Acad. 8 : 622. 



Rather widely and rigidly branched, glabrous : leaves apparently all 

 simple and greatly elongated, the outline linear-oblanceolate, the length 

 3-5 cm., base tapering, apex obtuse or subtruncate, texture firm, even 

 apparently subsucculent : fruit 7-8 mm. wide ; carpels subturbinate-pyri- 

 form, strongly but not closely nerved, the intervals as wider toward the 

 summit fenestrate-reticulate, the summit crowned with very prominent 

 mammiform tubercles, these somewhat connivent, or at least not at all 

 spreading. 



Maritime sand dunes of the shores of the Gulf of California northward, 

 and about the mouth of the Colorado River ; collected by Edw. Palmer, in 

 18P>5, and again by D. T. MacDougal in 1904 ; not otherwise known to me. 



9. Wislizenia costellata Rose sp. nov. 



Growing parts minutely and sparsely scaberulous ; whole herbage more 

 than usually glaucous, the branches very leafy, somewhat tortuous : leaves 

 and their petioles of about equal length ; leaflets cuneate-obovate, obtuse, 

 only 1.5-2 cm. long: racemes subsessile, 1-1.5 dm. long: fruit only 3 mm. 

 wide, the carpels at summit almost as thick as long, truncate at both ends, 

 marked longitudinally by 5 or 6 ribs and many intervening closely com 

 pacted striae, the main ribs gradually thicker toward the summit where 

 each ends in a stout low tubercle. 



Sonora, Mexico, between Nogales and Guaymas, June 4, 1897, J. N. 

 Rose, No. 1294 ; type specimens in the U. S. National Herbarium. Easily 

 distinct from W. refracta by the very short and thick strongly ribbed 

 carpels, which are also truncate at the apex. 



10. Wislizenia mamillata Rose sp. nov. 



Glabrous; leaves on slender petioles nearly as long as the leaflets, the 

 latter also conspicuously petiolulate, the blades narrowly oblong, acutish, 

 2-3 cm. long: fruiting raceme stout and elongated, 1-2 dm. long, short- 

 peduncled : fruit about 6.5 mm. wide, the carpels shuttle-cock-shaped, 

 coarsely and somewhat turgidly striate, not at all reticulate, somewhat con 

 stricted above the base, thence abruptly widening to a broad and strongly 

 mamillate-tuberculate summit. 



Guaymas, Sonora, Mexico, June, 1887, Edw. Palmer, No. 74, also by 

 J. N. Rose at the same place, June, 1897, Dr. Palmers' specimens having 

 been distributed for W. Palmeri ; but in characters of fruit the plant is 

 extremely different from W. Palmeri, and even the foliage is all trifoliolate, 

 while in W. Palmeri all the leaves are simple, or unifoliolate. 



