420 BOTANY, 



Prosopis ^ PUBESCENS, Benth. {Stroinhocarpa, Gray. Plant. Wright. 

 1. 60.) A shrub 6-20° higli ; stipular spines in pairs, short and straight; 

 pinnge 2, with 4^10 pairs of coriaceous oblong leaflets, 3-4" long, subpubes- 

 cent beneath and on the petioles ; peduncles axillary, shorter than the- 

 leaves; flowers in cylindrical spikes, 1-2' long ; calyx and petals yellowish 

 appressed-silky externally ; petals about 1" long ; stamens and style exsert; 

 ovary short-stipitate ; pod closely spiral, 1-2' long, cinereous-pubescent when 

 young. — The " screw-bean" of New Mexico and Arizona; Southern Nevada, 

 (Frdmont ;) Southern Utah, (Palmer.) ^ 



Peunus minutifloea, Eng. Plant. Lindh. 185. A shrub 1-6° high, 

 densely branched, subspinescent, glabrous with the young branchlets puber- 

 ulent ; leaves fascicled, small, 3-9" long, oval or obovate (or oblong-spatu- 

 late,) attenuate to a short glandless petiole, very obtuse or acutish, entire or 

 sparingly denticulate, more or less coriaceous, glabrous or somewhat puberu- 

 lent when young ; stipules very minute ; flowers solitary, 1^" long, subses- 

 sile, the calyx turbinate; stamens 10-15, in 2-3 rows ; fruit globular, 4-6" 

 in diameter, more or less tomentose ; the flesh thin and dry, narrowly 

 grooved on the ventral suture, separating from the globose smooth and even 

 stone, the sutures of which are but slightly ridged and grooved and the sides 

 not at all compressed. — Very near P. Andersonii. "Western Texas, New 

 Mexico, and Southern Utah, (Palmer.) 



Page 82. RuBUS strigosus, Mx. Labrador, (Rev. S. R, Butler.) 

 Page 83. Cercocaepus ledifolius, Nutt. Southern Utah, (Palmer.) 

 Page 93. Saxifeaga c^spitosa, L. Labrador, (Butler.) 

 Page 97. Parnassia paevifloea, DC. Labrador, (Butler.) 



' PEOSOPIS, L. Flowers 5-partecl, usually sessile. Calyx campanulate, short-dentate. Petals 

 connate below the middle or at length free, valvate. Stamens 10, free, shortly exsert ; anthers tapped 

 with a deciduous gland or rarely glandless. Ovary sessile or stipitate, many-ovnled ; style filiform; 

 stigma terminal, small. Pod linear, thick-compressed or suhterote, straight, falcate, or variously twisted, 

 coriaceous, indehisceut, the exocarp thin or coriaceous, mesocarp thick and spongy, hardly or rarely 

 thin, endooarp cartilaginous or papyraceous, continuous with the septa between the seeds and some- 

 times enwrapping them ; pod rarely subcontinuous within. Seeds usually ovate, compressed. — Trees or 

 shrubs, prickly, unarmed, or having solitary or geminate axillary spines or spiuescent stipules ; leaves 

 bipinnate, pinua3 usually 1-2 pairs, leaflets few-many pairs, often rather rigid ; stipules and glands small 

 or none ; flowers small, in cylindrical spikes or rarely in globose heads, peduncles axillary. Benth. & 

 Hook. Our North American species belong to the following sections, having the petals woolly at 

 apex and the ovary villous : — 



§ Algarobia, Benth. Pod elongated, usually falcate, flat or subtorete, continuous and moniliform 

 or subjointed. Spiny trees or shrubs, with cylindrical, spikes. — P. glandulosa, Torr. 



5 Stkombocaepa, Benth. Pod spirally twisted, with spongy mesocarp, endooarp sometimes thin. 

 Shrubs with spinesccnt stipules, and globose, oblong or cylindrical spikes. — P. pubescbns, Benth., and 



P. CINBRASCENS, H. & A. 



