106 FLORA OF PHILADELPHIA. 



Family 9. IRIDACEAE Lindl. Iris Family. 



Style-branches opposite the anthers very broad, petal-like. 1. Iris. 

 Style-branches alternate with the anthers, slender or filiform. 



Filaments all distinct; seeds fleshy. 2. GemmingiCk. 



Filaments united; seeds dry. 3. Sisyrinchium. 



3. IRIS L. Flower-de-Luce. 



Stems tall, usually several-flowered, leafy; outer perianth segments larger 

 than the inner. 

 Flowers blue, variegated with yellow, white or green (rarely all white). 

 Leaves 1-2.5 cm. wide. . 1. I. versicolor. 



Leaves much narrower, 4-8 mm. wide. 2. I. prismatica. 



Flowers bright yellow; introduced species. 3. I. Pseudacorus. 



Stems low, seldom over 1.5 dm. tall; 1-3-nowered; outer and inner perianth- 

 segments nearly equal. 4. I. verna. 



1. Iris versicolor L. Blue Flag. M. p. 282. Wet places. Early summer. 



2. Iris prismatica Pursh. Blue Flag. M. p. 283. Wet grounds. Spring. 



Bucks— Tullytown (Cr.), Sellersville (Fr.). Delaware— Tinicum (Fu.) 

 (St.), Williamson (Wn.). Chester— (P.). Lancaster— New Texas (P.). 

 New Jersey — Common. 

 New Castle— Frequent. 



3. Iris Pseudacorus L. Yellow Flag. M. p. 283. Escaped from cultiva- 



tion. Early summer. 



4. Iris verna L. Dwarf Iris. M. p. 284. Wooded hillsides. Spring. 



Lancaster— Wakefield (Ca.), Fulton Twp. (Pr.). 



2. GEMMINGIA Fabr. 

 1. Gemmingia Chinensis (L.) Kuntze. Blackberry Lily. M. p. 284. 

 Escaped from gardens. Early summer. 



3. SISYRINCHIUM L. Blue-eyed Grass. 



Stems mostly simple with a sessile, terminal spathe. 



Capsules 2-4 mm. long; leaf -blades mostly less than 1.5 mm. wide. 



1. S. mucronatum. 

 Capsules 4-6 mm. long; leaf -blades mostly over 1.5 mm. wide. 



,t 2. S. angustifoliuin. 



Stems mostly branched above, bearing two or more pedunculate spathes. 



Plant usually turning dark in drying; stem broadly winged; pedicels 



spreading or recurved. 3. S. graminoides. 



Plant not turning dark when dry; pedicels not recurved; spreading. 



4. 8. Atlanticum. 



1. Sisyrinchium mucronatum Michx. M. p. 286. Meadows and fields. 



Spring. 

 Bucks— Sellersville (Fr.). 



2. Sisyrinchium angustifolium Mill. M. p. 286. Fields and hillsides. 



Spring. 



3. Sisyrinchium graminoides Bicknell. M. p. 287. Moist meadows among 



grass. Spring. 



4. Sisyrinchium Atlanticum Bicknell. M. p. 287. Moist meadows along 



the coast. Spring. 

 Bucks— Tullytown (Fr.). 

 New Jersey— Common. 



