JUNCACEAE. 93 



2. TRADESCANTIA L. 

 1. Tbadescaijtia Virginiana L. Spiderwort. M. p. 241. Rich soil. Smnmer. 



Family 4. PONTEDERIACEAE Dumort. Pickerel weed Family. 



Flowers 2-lipped, stamens 6; fruit a 1-seeded utricle. 1. Pontederia. 



Flowers regular; stamens 3; fruit a many-seeded capsule. 2. Heteranthera. 



1. PONTEDERIA L. 

 1. Pontederia cordata L. Pickerel-weed. M. p. 243. Borders of ponds 

 and streams. Sunuaer. 



la. Pontederia cordata lancifolia (Muhl.) Morong. M, p. 243. Borders 

 of ponds and streams. Summer. 

 Pliiladeliihia— T>e\avf are river near the city (Cr.). Lehigh— (P.). 

 Burlington— Q^usikeT Bridge (C), Atsion (Fr.). Gloucester— FraxikUji 

 (C), Washington Park (Ja.). 



2. HETERANTHERA R. & P. 

 Leaves mostly reniform, sometimes cordate-ovate. 1. H. reniformis. 



Leaves linear, grass-like, floating. 2. H. dubia. 



1. Heteranthera reniformis R. & P. Mud Plantain. M. p. 243. Mud 



or shallow water. Summer. 



2. Heteranthera dubia (Jacq.) MacM. M. p. 243. Still water. Summer. 



Order 6. LILIALES. 



Ovary superior (except in Aletr-is of the Liliaceae). 



Perianth-segments distinct, green or brown, not petal-like; herbs with 



grass-like leaves and small flowers. Fam. 1. Juncaceae. 



Perianth-segments distinct, or partly united, at least the inner petal-like. 

 Fruit a capsule. 



Capsule mostly septicidal; plants rarely bulbous. 



Fam. 2, Melanthaceae. 

 Capsule loculicidal ; plants mostly bulbous. 



Fam. 3. Liliaceae. 

 Fruit a fleshy berry. 



Erect herbs, tendrils none ; flowers perfect. 



Fam. 4. Convallariaceae. 

 Vines, climbing by tendrils, or rarely erect; flowers dioecious, 

 in axillary umbels. Fam. 5. Smilaceae. 



Ovary inferior, wholly or in part. 



Stamens 3, opposite the inner corolla-segments, 



Fam. 6. Haemodoraceae. 

 Stamens 6. 



Erect perennial herbs ; flowers perfect. Fam. 7. Amaryllidaceae. 

 Twining vines; flowers dioecious. Fam. 8. Dioscoreaceae. 



Stamens 3, opposite the outer corolla-segments. 



Fam. 9. Iridaceae. 



Family 1. JUNCACEAE Vent. Rush Family. 



Leaf -sheaths open; capsule 1-3-eelled, many-seeded; placentae parietal or 



axial. 1, Juncus. 



Leaf -sheaths closed; capsule 1-celled, 3-seeded, its placenta basal. 



2. Juncoidea. 



