IRIDACEAE. 



VOL. I. 



4. Iris foliosa Mackenzie & Bush. Leafy 

 Blue-flag. Fig. 1331. 



Iris foliosa Mackenzie & Bush, Trans. Acad. St. Louis 

 12: Hi. 1902. 



Rootstock stout. Stem terete, zigzag, i-ii tall; 

 leaves conspicuously overtopping the inflorescence, 

 green, t'-ii' wide, the larger ones about 2 long; 

 flowers axillary, on pedicels io"-i4" long; perianth- 

 segments bluish, spreading, 2\' long, about i' wide, 

 not crested ; capsule strongly 6-angled, oblong- 

 cylindric, about lY long, short-beaked; seeds in 2 

 rows in each cavity. 



In swamps, Kentucky to Illinois, Missouri and Kansas. 

 June-July. 



5. Iris Hookeri Penny. Hooker's Blue-flag. 

 Fig. 1332. 



Iris Hookeri Penny; Steud. Nomencl. Ed. 2, Part i, 822. 



1840. 

 /. setosa canadensis Foster, Rhodora 5: 158. 1903. 



Rootstock rather slender. Stems slender, simple 

 or branched, terete, io'-2 tall. Leaves mostly basal, 

 narrowly linear, bright green, shorter than or equal- 

 ling the stem, 2"-$" wide ; flowers solitary or 2 

 together, violet-blue and white, pedicelled, the pedi- 

 cels shorter than the bracts; perianth-segments gla- 

 brous, crestless, the inner ones involute, oblanceolate, 

 much shorter and smaller than the outer; capsule 

 short-oblong, blunt, i'-ii' long, 7"-io" in diameter, 

 thin-walled, transversely veined, obtusely 3-lobed ; 

 seeds in 2 rows in each cavity, about li" broad, the 

 raphe prominent. 



On river shores, Newfoundland and Labrador to 

 Quebec and Maine. Closely related to the Asiatic Iris 

 setdsa Pall. Summer. 



6. Iris missouriensis Nutt. Western Blue-flag. 

 Fig- 1333- 



I. missouriensis Nutt. Journ. Acad. Phila. 7: 58. 1834. 



Rootstock stout. Stem rather slender, usually simple, 

 terete, 6'-2 tall, i-2-flowered ; leaves mostly basal, 

 green, sometimes purplish below, shorter than or about 

 equalling the stem, 2"-^" wide; flowers pale blue and 

 variegated, pedicelled; pedicels slender, \'-2 r long, 

 usually shorter than the scarious bracts; perianth- 

 segments glabrous, crestless, the outer ones 2 r -2i' long, 

 the inner somewhat shorter, the tube 3" -4" long above 

 the ovary; capsule oblong, i'-ii' long, about in 

 diameter, obtusely 6-angled, faintly veined. 



In wet soil, South Dakota to Montana, Idaho and Ne- 

 vada, south to Colorado and Arizona. May-July. 



