316 PLANTS NOV^ THURBERIAN^. 



digotica, vexillo dilatato obcordato alisque ovalibus carina brevioribus ; fructu calycem 

 excedente. — Arroyos on tlie Gila ; and on the Californian desert west of the Colo- 

 rado, \yhere it was also gathered by Fremont, in 184:9, without flowers or fruit. — A 

 remarkable species, allied to the Xew-Mexican D. scoparia. It is a much branched, 

 spinescent, shrubby plant, of 4 or 5 feet in height ; the branches glabrate with age, and 

 \ naked. Leaves 6 to 9 lines long, from half a line to tM'o lines wide, obscurely striate 



in the dried state. Flowers scattered or rather crowded and spicate along a mostly spi- 

 nescent branchlet or rhachis. Calyx three lines long, including the very short pedicel, 

 cinereous-pubescent like the rest of the plant, usually bearing a circle of large and 

 brown pustular glands near the summit of the tube. Corolla large and much exserted, 

 of a deep violet or indigo blue, as in D. scoparia ; no glands found on the petals. Sta- 

 mens 10. Fruit turgid, obliquely ovoid or oblong, pointed, canescent, beset with 

 glands four lines long.* 



HosACKiA (Syrmatium) argophylla (sp. nov.) : suff"ruticosa, undique dense sericeo- 

 tomentosa, incana ; ramis elongatis decumbentibus ; foliolis 3-5 obovatis obtusis ; 

 capitulis brevissime pedunculatis plurifloris foliolo unico bracteatis ; dentibus calycis 



• The characters of two more shrubby species, gathered in nearly the same region by Colonel Fremont, 

 in his second expedition, are subjoined. 



Dalea Fremontii (Torr. ined.) : fniticosa, ramosissima, parce glanduloso-punctata, sericeo-puberula ; 

 foliis petiolatis simplicibus obovato-spathulatis vel plerisque trifoliolatis, foliolis obovatis; floribus secus ramu- 

 los subspinescentes sessilibus laxe spicato-confertis patentibus singulis aut folio aut ssepius bractea parva 

 subulata stipatis ; dentibus calycis acutissimis tubo campanulato vix costato subaequilongis, 2 superioribus tri- 

 angulatis, cteteris subulatis ; corolla purpurea ; vexillo obcordato alls et carina fere cequalibus. — Mountains of 

 the Pah-Utah country, S. W. California ; on rocks ; May, Fremont. — Apparently a low or depressed shrub, 

 with copious reddish-purple flowers, of 4 or 5 lines in length. Calyx minutely silky-pubescent, like the other 

 young parts of the plant, beset with many inconspicuous glands. Rhachis beset with a few minute setae. 

 Leaflets, or blade of the occasionally simple leaf, three lines long, shorter than the petiole. 



Dalea arborescens (Torr. ined.) : ramosissima, fere eglandulosa, subspinescens ; ramis adultis glabratis, 

 novellis cum foliis calycibusque cano-tomentosis ; foliolis bijugis cum imparl approximatis obovatis ; floribus 

 in spicam densam brevem congestis ; bracteis parvis subulatis ; dentibus calycis acuminatis tubo campanulato 

 Eequilongis, 2 superioribus oblongo-triangulatis, cffiteris angustioribus lanceolatis ; petalis (purpureis?) fere 

 sequalibus. — Mountains of San Fernando, a southern branch of the Sierra Nevada, California ; April, Fre- 

 monl. — "A small tree ! " Glands scarcely any ; a few minute tubercular ones occasionally found on the 

 branchlets when denuded of the dense woolly covering. Leaves petioled ; the leaflets only 2 or 3 lines long. 

 Spikes ovate or oblong. Flowers 5 or 6 lines long ; the calyx large in proportion ; the tube obscurely stri- 

 ate. Vexillum obcordate. — A remarkable species, especially for the size of its stem. 



