LILIACEAE 9 



12. Potamogeton pectinatus L. 



Common in the sand-hill regions. Alliance; Crawford; Kennedy; 

 Thedford; Valentine; Whitman. 



13. Potamogeton interior Rydb. 

 Nebraska according to Gray's manual. 



14. Potamogeton interuptus Kitaibel. 

 In the mill-pond at Xeligh. 



2. Ruppia. 49. 



1. Ruppia occidentalis Watson. 



In salt or alkaline ponds. Alliance; Sheridan County. 



3. Zannichellia. 50. 



1. Zannichellia palustris L. 



In ponds throughout the state. Banner County; Broken Bow; Cody's 



Lakes; Lincoln; Simeon. 



LILIALES. 



Perianth segments, at least the inner, corollo'id. 

 Perianth segments all corolloid. 



Stamens 6, all alike. 1. Liliaceae. 



Stamens unlike or only 3. 2. Pontederiaceae. 



Perianth segments unlike, the inner corolloid; the outer green. 

 Leaves whorled or ovules numerous. 1. Liliaceae. 



Leaves not whorled; ovules usually 2 in each cavity. 



3. Commelinaceae. 

 Perianth segments scaly, green or brown, or wanting. 



Land or marsh lands with a scaly perianth. 4. Juncaceae. 



Submerged water plants, perianth often wanting. 5. Naiadaceae. 



1. LILIACEAE. 



Herbs, not climbing. 



Styles distinct. 1. Zygadenus. 



Styles united, or short or wanting. 

 Sepals and petals nearly alike. 

 Plants with bulbs or corms. 



Flowers in umbels with scarious involucres. 



Ovules 2 in each cavity of the ovary, foliage onion scented. 



3. Allium. 



Ovules many in each cavity of the ovary, foliage not onion 



scented. 4. Nothoscordium. 



Flowers not in involucrate umbels. 



Anthers attached near the middle, versatile, 5. Lilium. 



Anthers attached near the base, not versatile. 



Stems leafy, leaves several. 6. Fritillaria. 



Leaves 2, basal. 7. Erythponium. 



Plants without bulbs or corms, often with root-stocks. 

 Leaves basal, root-stock short and erect or none. 

 Plants with a single flower. 2. Leucocrinum. 



Plants with many flowers. 9. Yucca. 



Stems leafy, root-stocks horizontal, elongated. 

 Real leaves scaly, appearent leaves filiform branches. 



10. Asparagus. 



