56 PONTEDERIACEAE 



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

 August. 



2. TRADESCANTIA L. 

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

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

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



Sepals nearly jrlabrous. 1. T. reflexa. 

 Sepals strou<;ly hairy. 



Leaves long-ciliate at base. 2. T. occidentalis. 



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



1. T. reflexa Kaf. Smooth Spiderwort. 1°-4° high, glaucous : 

 leaves spreading, 8'-20'' long, 5^''-7''' wide : umbels many-llowered : 

 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. l°-2° high, 

 glabrous : leaves ascending, short-hairy, 7^-15^ long, 3''''-5^^ wide, flattish, 

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

 and at Dodson. May-June. 



3. T. bracteata Small. Hairy Spiderwort. 8'-1.5^ high: leaves 

 widel}' spreading, 4^-8' long, 5^-8''' wide, strongly keeled : umbels few- 

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



Family 18. PONTEDERIACEAE Dumort. 

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

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

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

 ovuled. 



Stamens six. 1. Pontederia. 



Stamens three. 2. Hetekanthera. 



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. 1°-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 U. & P. 



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

 Stamens three. Ovary 3-celled with numerous ovules. 



Flowers blue. 



Spatlies 2-()-flowered. 1. If. reniformis. 



Spathes 1 -flowered. 2. //. limosa. 



Flowers yellow. 3. If. dubia. 



