CATALOGUE. 109 



oblong or oblong-obovate, 2 or 3 lines long, rounded or truncate above, 

 narrower at base, rather thick and with 2 or 3 straight nerves : flowers in 

 cylindrical spikes an inch or two long, the peduncles equalling or exceed- 

 ing the leaves : pods thin-coriaceous, flat, 3 or 4 inches long by 5 to 7 lines 

 broad, shortly stipitate, acute, curved, glabrous and reticulated, more or 

 less constricted between the seeds : seeds half an inch long. — From Western 

 Texas to Southern California ; collected in Western Arizona, 1872. 



Acacia consteicta, Benth. (Gray, PL Wright, i, 66). — A shrub 5 

 to 8 feet high, puberulent or nearly glabrous, somewhat glutinous, more or 

 less armed with nearly straight slender stipular spines, 3 or 4 lines long 

 or less : pinnae 2 to 7 pairs; leaflets 6 to 10 pairs, narrowly oblong, obtuse, 1 to 

 1£ lines long: peduncles solitary, shorter than the leaves, bracteate in the mid- 

 dle : head globose, 3 or 4 lines in diameter in flower : pods stipitate, narrowly 

 linear, 2 to 4 inehes long, curved, glabrous, flat, contracted between the dis- 

 tant seeds. — From Western Texas to Arizona and southward ; collected at 

 Cottonwood, Cienega, and in the Gila Valley, Ariz , Rothrock (322, 553). 



Acacia filicina, Willd. (A. hirta, Nutt. A. Texensis, Torr. & Gray. 

 A. cuspidata, Schlecht. A. Hartwegi, Benth.; &c.) — A shrub 1 to 5 feet high, 

 erect, pilose-hirsute or glabrate, unarmed : pinnae 4 to 20 pairs, a half to 

 two inches long; leaflets 10 to 60 pairs, linear or linear-oblong, acute or 

 obtusish, l£ to 3 lines long : heads globose, rather few-flowered, on slender 

 peduncles a half to an inch long, mostly paniculate : flowers pedicellate : 

 calyx very short : corolla greenish, a line long : stamens pale yellow, rarely 

 pinkish : pods stipitate, 1 to 3 inches long, 3 to 5 lines broad, flat, straight, 

 with thin valves and nerve-like margins, 3-8-seeded. — Arkansas to Arizona 

 and southward to Central America; in Western Arizona, 1872, and at Rocky 

 Canon, Rothrock (300). 



Calliandra* humilis, Benth. (Lond. Journ. Bot v, 103). (C. 

 herbacea, Engelm. in Gray, PL Fendl. 39.) — A span high or less, nearly 

 herbaceous, ascending from an elongated woody root, pilose or sometimes 



* Calliandra, Benth. — Flowers polygamous. Calyx campanulate, 5-6-toothed or cleft, valvate. 

 Petals united to the middle, valvate. Stamens usually numerous, connate below into a tube, long- 

 exserted, red or white; anthers minute; pollen in 2 or 4 masses in each cell. Style filiform. Pod linear, 

 straight or nearly so, narrowed at base, compressed, the valves separating elastically from the apex 

 downward. — Shrubby or woody only at base, mostly unarmed ; leaves bipinnate with small leaflets (in 

 our species); flowers in globose heads on axillary simple or racemose peduncles. — Benth. & Hook. 

 Gen. PI. i, 596. 



