Key 



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(2) Branches without tendrils. 



0. Branches zigzag Colubrina — 131 



p. Branches not zigzag Croton — 120 



(y) Vines or plants with prostrate 

 stems. 



(a) Stems woody. 



(1) Leaves fleshy, ill-smelling Cissus— 133 



(2) Leaves not fleshy Vitis— 132 



(b) Stems not woody. 



(1) Leaves 3—10" long, ill- 

 scented Curcurbita — 202 



(2) Leaves less than 3" long. 



1. Leaves broader than long. 



(m) Vine with tendrils. Passiflora— 141 



(n) Stems prostrate, ten- 

 drils none. 



(1) Flowers bonnet- 

 shaped Dolicholus — 108 



(2) Flowers not bonnet- 



shaped Bowlesia— 153 



2. Leaves not veiny, or 



broader than long, 

 o. Leaves with stinging 



hairs Tragia— 122 



p. Leaves smooth Ibervillea— 201 



<z) Plants neither shrubs nor 

 vines. 



1. Petals none. 



o. Stems channeled, leaves 



green Ditaxis — 121 



p. Stems rusty, not channeled Croton — 120-1 



2. Petals or lobes of corolla 4 



or 5. 



o. Upper leaves and bracts 



tipped with orange Castilleja— 192 



p. Upper leaves not colored. 



(1) Stamens 2, buds red... Menodora — 158 



(2) Stamens 5 Linum— 112-3 



(3) Stamens numerous. 



o. Flowers 1" or more 



across Wissadula — 134 



