WOOTON AND STANDLEY FLORA OF NEW MEXICO. 329 



KEY TO THE SPECIES. 



Flowers in elongated spikes; pods flat, 15 to 20 mm. wide, curved; 



spinss short and hooked 1. A. greggii. 



Flowers in globose heads; pods terete, or if flat less than 10 mm. 

 wide, straight; spines straight and slender or none. 

 Spiny slirub 1 meter high or more; flowers bright yellow, 

 sweet-scented; pods terete, constricted between the 



seeds 2. A. constricta. 



Unarmed shrubs less than 1 meter high; flowers whitish, 

 odorless; pods flat and thin. 

 Leaflets 8 to 13 pairs, obtuse; inflorescence nearly always 



axillary .3. A. cuspidata. 



Leaflets 18 pairs or more, acute; inflorescence becoming 



panic'tdate, sometimes axillary 4. A. Jilicioides. 



1. Acacia greggii A. Gray, PI. Wright. 1: 65. 1852. 

 Type locality: Western Texas. 



Range: Western Texas to southern Arizona and adjacent Mexico. 

 New Mexico: Redrock; Lone Pine; Carlisle; west of Roswell. Lower Sonjoran 

 Zone. 



2. Acacia constricta Benth.; A. Gray, PI. Wright. 1: 66. 1852. 



Type locality: Prairies near the source of the San Felipe, western Texas. 



Range: Southwestern Texas to southern New Mexico and Arizona, south into 

 Mexico. 



New Mexico: Redrock; Big Hatchet Mountains; mesa west of Organ Mountains; 

 Carlsbad; La Luz Canyon; Lakewood. Dry hills and plains, in the Lower Sonoran 

 Zone. 



2a. Acacia constricta paucispina Woot. & Standi. Bull. Torrey Club 36: 105. 

 1909. 



Type locality: On Animas Creek, in the Black Range, New Mexico. Type col- 

 lected by Metcalfe (no. 1123). 



New Mexico: Animas Creek; Organ Mountains; Carlisle; Burro Mountains; Hills- 

 boro. Upper Sonoran Zone. 



This is a larger plant with fewer spines and larger, much less glandular, more pubes- 

 cent leaves and young stems, occurring usually at slightly higher levels than the 

 species. It is found in western Texas and southern Arizona as well. 



3. Acacia cuspidata Schlecht. Linnaea 12: 573. 1838. 

 Type locality: "Prope Mexico." 



Range: Western Texas to southern Arizona, south into Mexico. 

 New Mexico: Black Range; Mangas Springs; Organ Mountains; Dog Spring; 

 Hanover Mountain. Dry hills, in the Upper Sonoran Zone. 



4. Acacia fiHcioides (Cav.) Trel. Rep. Ark. Geol. Surv. 4: 178. 1891. 

 Mimosa fdicioides Cav. Icon. PL 1: 55. pi. 78. 1791. 



Type locality: "Habitat in Mexico." 



Range: Missouri and Kansas to Texas and Arizona, south into Mexico. 

 New Mexico: San Luis Mountains; near White Watar. Dry hills, in the Lower 

 Sonoran Zone. 



3. STROMBOCARPA A. Gray. Screw bean. Tornillo. 



A tall, gracefully spreading shrub 5 meters high or less, branching from the base, 

 with dense dark-colored wood; loaves small, with 1 or 2 pairs of pinna;; leaflets 5 

 to 8 pairs, short-oblong; stipuiar spines rigid, 2 cm. long or less, whitish; flowers yel- 

 low, in crowded spikes; pod an indehiscent, spirally coiled legume. 



