314 LILY ORDER 



• 

 (x) Parts of the perianth greenish; 



capsule shorter than the perianth /. tenuis 

 (y) Parts of the perianth brown ; cap- 

 sule equalling the perianth /. confusus 

 y. Leaves terete /. Vdseyi 

 (2) Flowers in heads 



(a) Leaves flat 



x. Stamens 3 /. margindtus 



y. Stamens 6 /. longistylis 



(b) Leaves hollow and tube-like 



x. Head usually single, 3-flowered ; leaves 



flattened above /. triglumis 



y. Heads 1-3, 3-12-flowered ; leaves terete 



above /. castdneus 



b. Flower-cluster lateral and sessile ; stems leaf- 

 less 



(1) Cluster usually of 1-3 flowers 



(a) Stems entirely without leaves /. subtrifldrus 



(b) Stems somewhat leafy 



x. Capsule blunt, equalling the perianth J.Hdllii 

 y. Capsule pointed, longer than the 



perianth /. Pdrryi 



(2) Cluster of several to many flowers 



(a) Perianth and capsule brown; capsule 



long-pointed /. bdlticus 



(b) Perianth and capsule green ; capsule 



barely pointed /. Uliformis 



PONTEDERIACEAE PICKEREL WEED FAMILY 



Perianth of 6 parts, corolla-like, nearly regular, stamens 3, ovary more 

 or less 3-celled, stigma 3-lobed, fruit a many-seeded capsule enclosed in the 

 withered perianth-tube; flowers 1-several, enclosed by a spathe ; bog or 

 aquatic perennials with petioled leaves with broad blades, or grass-like. 



Heteranthera Roemer and Schultes 1794 Mud Plantain 

 (Gr. heteros, different, anthera, anther) 



Characters of the family. 

 Stems 6-15 in. long; leaves ovate, about 1 in. long; 



flowers white or blue H. limosa 



