KEY. 137 



83. Stamens 1 to 12 83 



Stamens more than 12 , 212 



83. I. Petals 5, or more 135 



II. Petals 4 98 



III. Petals 3 86 



IV. Petals 2 84 



V. Petal solitary. Stamens 10, monadelphous at the 



base. Pod oblong, 1- or 2-seeded, tardily dehiscent. Shrubs, 

 with odd pinnate leaves; the leaflets minutely dotted. 

 Flowers violet, in clustered, terminal, dense spikes. 



wAjnorpha. 



84:. Herbs with (mostly) hollow, jointed stems (culms) 



and alternate leaves on tubular, split, or open sheaths. A 



corolla of 2 calyx-like petals ; a 2-valved c^yx ; stamens 3 



(rarely 1, 2, or 6) ; styles mostly 2 (rarely 1). Grasses. 565. 



Herbs with stems 85 



85. Sepals, petals, stamens and stigmas 2 (or 3). 



Elatine Americana, Arnott. 



The 2 inner pieces of the 4-leaved perianth broader. 

 Stamens 4. Leaves kidney-shaped. 



Oxyria Digyna (669), Campd. 

 ( O. reniformis. Hook.) 



86. A soui'fy epiphyte, growing on the branches of trees. 

 The 3 sepals linear, membranaceous, as long as the 3 lance- 

 oblong, yellow petals. Stem and leaves thread-form, the for- 

 mer branched. Peduncles short, 1-flowered. 



Tillandsia usneoides, L. 

 No epiphytes , 87 



87. Leaves veined lengthwise, grass- or rush-like, con- 

 tracted at the base into sheathing petioles. Sepals and pe- 

 tals 3. Perfect stamens 6 or 3 88 



Leaves netted-veined (or coriaceous, often short-li- 

 near) 90 



88. Stamens (perfect ones) 3. Petals white or yellow. 89 

 Stamens 6, with bearded filaments. Petals blue or 



rose-color. Flowers in umbelled clusters, axillary and termi- 

 nal. Tradesceintia. 



89. Petals white. Flowers single, terminating a naked 



