56 PONTEDEEIACEAE 



In sandy soil near Martin City, Little Blue Tank and Lake City. July- 

 Angust. 



2. TRADESCANTIA L. 

 Bracts leaf-like. Flowers regular, umbellate. Sepals and petals three 

 each, the latter ovate and sessile. Stamens 6, all similar, the filaments 

 beautifully bearded. Ovary 3-oelled, with 2 ovules in each cell. 



Sepals nearly glabrous. 1. T. rejlexa. 

 Sepals strongly hairy. ' 



Leaves long-oiliate at base. 2. T. oceidentalia. 



Leaves not long-ciliate at base. 3. T. bracteaia. 



1. T. refleza Eaf. Smooth Spiderwort. 1°-4° high, glaucous : 

 leaves spreading, 8'-20'' long, h"-'!" wide : umbels many-flowered : 

 pedicels reflexed at maturity : sepals hairy at tip : petals blue or pur- 

 plish. — Common in open ground, especially on prairies. May-June. 



2. T. occidentalis Britton. Western Spiderwort. 1°-2° high, 

 glabrous : leaves ascending, short-hairy, 7'-] 5' long, S'^-S'^wide, flattish, 

 exceeding the stems : umbels few- flowered. — In barrens along Brush Creek 

 and at Dodson. May-June. 



3. T. bracteata Small. Haiey Spiderwort. 8'-15' high: leaves 

 widely spreading, 4'-8' long, h"-V wide, strongly keeled : umbels few- 

 flowered : flowers reddish. — Frequent on prairies throughout. May-Jnne. 



Family 18. PONTEDERIACEAE Dumort. 

 Marsh plants with flowers subtended by leafy spathes. Perianth col- 

 ored, 6-merous, free from the ovary. Stamens 3 or 6, inserted on its 

 tliroat, unequal. Ovary 3-celled and many-ovuled, or 1-celled and 1- 

 ovuled. 



Stamens six. 1. Pontederia. 



Stamens three. 2. Heteranthera. 



1. PONTEDERIA L. 



Flowers numerous, blue, ephemeral, on a long scape. Perianth 2- 

 lipped, the upper three lobes ovate, the three lower linear-oblong and 

 spreading. Stamens six, three long-exserted, the other three on short fila- 

 ments. Ovary 3-celled, two of the cells abortive, the other. 1-ovuled. 



1. P. cordata L. Pickerel Weed. l°-3° high : leaves ovate, cor- 

 date-sagittate, long-petioled, blunt at apex : inflorescence glandular- 

 pubescent. — Occurs locally in marshes between Adams and Lake City. 

 June-August. 



2. HETERANTHERA E. & P. 



Spathes 1-several flowered. Flowers small. Perianth divisions equal. 

 Stamens three. Ovary 3-celled with numerous ovules. 

 Flowers blue. 



Spathes 2-6-flowered. 1. j. reniformis. 



Spathes 1-flowered. 2. H. Kmosa. 



Flowers yellow. 3. fr. aubia. 



