Key 



51 



(b) Rachis not winged. Page 



(1) Flowers in hanging ' 



clusters Sophora — 100 



(2) Flowers in erect spikes. 



o. Flowers white Eysenhardtia — 105 



p. Flowers purple Amorpha — 111 



2. Leaves twice-pinnate. 



m. Branches prickly or thorny. 



r. Leaflets on a flattened axis Parkinsonia — 98 



s. Leaflets not on a flattened axis. 



(a) Prickles recurved. 



o. Flowers pink Mimosa — 96 



p. Flowers white Acacia — 92-3 



(b) Prickles or thorns straight. 



(1) Flowers in spherical heads. 



o. Flowers yellow Vachellia — 94 



p. Flowers white Acacia — 93 



(2) Flowers in oblong clusters. 



o. Leaflets about 1" long Prosopis— 96 



p. Leaflets less than 1" long Acacia— 93 



n. Branches not prickly. 



1. Flowers white Acacia— 93-4 



2. Flowers reddish Calliandra — 94 



II. Leaves simple. 



A. Leaves parallel-veined. 



a. Leaves with hooked spines on margin Dasylirion 66 



b. Leaves not armed with hooked spines. 



r. Leaves fleshy, thick, spine-toothed Agave — 67 



s. Leaves neither fleshy nor spine-toothed. 



(1) Leaves slender, grass-like Nolina — 65-6 



(2) Leaves not slender or grass-like Yucca — 64-5 



B. Leaves with netted veins. 

 (I) Leaves mainly opposite. 



x. Leaves with 1 main vein at base. 



a. Branches thorny. 



( 1 ) Leaves linear Castela— 118 



(2) Leaves broader than linear Bumelia— 158 



b. Branches not thorny. 



m. Branches zigzag Colubrina — 131 



n. Branches not zigzag, 

 r. Leaves less than 1" long. 



(1) Leaves aromatic Aloysia — 179 



