MIMOSA FAMILY 475 



1. CALLlANDRA Benth. in Hook. Journ. Bot. 2: 138. 1840. 



Herbs, shrubs, or trees, with bipinnate leaves and capitate flowers, the heads pe- 

 duncled, axillary or in terminal racemes. Calyx 5-toothed or 5-lobed. Petals united to 

 about the middle into a 5-lobed funnelform or campanulate corolla. Stamens numerous, 

 long-exserted ; filaments united below into a tube; anthers small, glandular-pubescent or 

 glabrous; pollen grains agglomerate. Style filiform; ovules many. Legume linear, usu- 

 ally narrowed below, flat, straight or nearly so, not pulpy within, elastically dehiscent 

 from the apex, the valves coriaceous with raised margins. Seeds orbicular or obovate, 

 compressed. [Name Greek, meaning beautiful stamens.] 



A genus of about 150 species, natives of subtropical and tropical America, Africa, and India. Type species, 

 Calliandra Houstonii (L'Her.) Benth. Anneslia Salisb. (1807) has priority but Calliandra is conserved. 



1. Calliandra eriophylla Benth. Hairy-leaved Calliandra. Fig. 2544. 



Calliandra eriophylla Benth. Lond. Journ. Bot. 3: 105. 1844. 



Calliandra Chamaedrys Engelm. ex A. Gray, Mem. Amer. Acad. II. 4: 39. 1849. 



Calliandra conferta Benth. ex A. Gray, PI. Wright. 1 : 63. 1852. 



Anneslia eriophylla Britt. & Rose, N. Amer. Fl. 23: 59. 1928. 



Low much branched shrub, commonly about 30 cm. high, two or more main branches usually 

 arising from the same root, the older branches gray, the young twigs brownish with the broad 

 striae canescent with a downwardly appressed pubescence. Stipules subulate-setaceous ; pinnae 

 1-7 pairs ; leaflets usually 5-8 pairs, oblong, 3-4 mm. long, obtuse or acutish, more or less stri- 

 gose ; heads racemose or axillary, few-flowered ; flowers sparingly strigose, reddish purple ; 

 calyx 1-1.5 mm. long; corolla 4-6 mm. long; stamens about 2 cm. long, united at base into a 

 short tube ; legume 3-6 cm. long, about 5 mm. wide, tapering below the middle, densely short- 

 pubescent with downwardly appressed hairs. 



Rocky canyons and hillsides, Lower Sonoran Zone; Chocolate Mountains, southeastern California, to western 

 Texas, south to Lower California and Puebla, Mexico. Type locality: Chila, Puebla, Mexico. March-May. 

 False Mesquite. 



2. ACACIA [Tourn.] Mill. Gard. Diet. Abr. ed. 4. 1754. 



Trees or shrubs, or some species nearly herbaceous, with bipinnate leaves, the ulti- 

 mate leaflets usually small and numerous, or the leaves in many exotic species modified 

 into simple flat phyllodia. Flowers small, usually yellow, in heads or spikes. Calyx usu- 

 ally 4-5-toothed, or the sepals distinct. Petals usually 4 or 5, distinct or united, or want- 

 ing. Stamens many, exserted; filaments filiform, distinct; pollen grains cohering in twos 

 to sixes. Pod linear to oval, flat or swollen, often constricted between the seeds. [Greek, 

 meaning point or thorn, many species being thorny.] 



A genus of perhaps 300 species, chiefly in subtropical regions, and most abundant in Africa and Australia. 

 Type species, Mimosa scorpioides L. 



1. Acacia Greggii A. Gray. Gregg's Acacia, Cat-claw, Ufia-de-gato. Fig. 2545. 



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



Senegalia Greggii Britt. & Rose, N. Amer. Fl. 23: 110. 1930. 



Shrub or small tree, the grayish-brown branches usually rigid and armed with short, more 

 or less flattened and recurved spines. Leaves with 2 or 3 pairs of pinnae, cinereous-pubescent 

 throughout; leaflets oblong to obovate, 3-6 mm. long; spikes 3-5 cm. long, about equaling the 

 peduncles; flowers light yellow; pods flat, 8-12 cm. long. 



Desert hillsides and canyons, Lower Sonoran Zone; Colorado Desert, southern California, to western Texas, 

 Lower California, and Sonora. Type locality: western Texas. April- June. 



Acacia Farnesiana (L.) Willd. Sp. PI. 4: 1083. 1806. Small tree or arborescent shrub. Leaves de- 

 ciduous; leaflets 3-8 pairs, glabrous, linear-oblong, 2-6 mm. long; flowers bright yellow, in globose heads on slen- 

 der pubescent peduncles; pod oblong or cylindric, often thicker than wide, 3-7.5 cm. long. This Mexican and 

 tropical American species has been collected {Wolf) near Otay, San Diego County, California, where it was 

 probably introduced. 



3. PROSOPIS L. Mant. 1:10. 1767. 



Trees or shrubs often armed with axillary spines or spinescent stipules. Leaves bi- 

 pinnate with 1 or 2 pairs of pinnae and usually small entire leaflets. Flowers greenish, 

 regular, in cylindric or globose axillary pedunculate spikes. Calyx campanulate, the teeth 

 very short and valvate. Petals 5, valvate, united below the middle or at length free, woolly 

 on the inner side. Stamens 10, free and exserted; anthers tipped with a deciduous gland. 

 Ovary villous ; style filiform. Pod linear, compressed or nearly terete, straight, falcate 

 or spirally coiled, coriaceous and indehiscent, usually pulpy within. Seeds numerous, ovate, 

 compressed. [Ancient Greek name of some very different plant.] 



About 10 species, natives of the warm temperate and tropical regions. Type species, Prosopis spicigera L. 



Pods not coiled. L P chilensis glandulosa. 



Pods spirally coiled. 2. P. pubescens. 



