IRIS FAMILY. 
g. Iris Pseudacorus L. Yellow Flag. 
(Fig. 1077.) 
Tris Pseudacorus I,. Sp. Pl. 38. 1753. 
Rootstock thick. Stems 144°-3° high, usually sev- 
eral-flowered; leaves pale green and glaucous, stiff, 
4/’-8’ wide, the lower equalling or longer than the 
stem; flowers bright yellow, short-pedicelled; peri- 
anth-segments glabrous and crestless, the outer 
broadly obovate, 2/’-214’ long, the inner oblong, 
nearly erect, scarcely longer than the claws of the 
outer ones; capsule oblong, 2’-3’ long. 
In marshes, Massachusetts to New York (Ohio?) and 
New Jersey. Naturalized or adventive from Europe. 
May-July. 
to. Iris cristata Ait. Crested Dwarf 
Iris. (Fig. 1078.) 
Tris cristata Ait. Hort. Kew. 1:70. 1789. 
Rootstock slender, branched, creeping, tuber- 
ous-thickened. Stems only 1/-3/ high, 1-2- 
flowered; leaves lanceolate, bright green, 4/—9’ 
long, 3/’-9/ wide, much exceeding the stems; 
scape flattened, flowers blue, pedicelled; peri- 
anth-segments obovate, 1/-114’ long, the outer 
crested, little longer than the naked inner ones, 
the tube very slender, 114/-214’ long above the 
ovary, longer than the bracts; capsule oval, 
sharply triangular, narrowed at each end, 6//— 
9 high, 4//-5’’ thick. 
On hillsides and along streams, Maryland to 
southern Ohio and Indiana, south to Georgia, Ten- 
nessee and Missouri. April-May. 
11. Iris lacistris Nutt. Dwarf Lake S / 
Iris. (Fig. 1079.) 
Tris lacustris Nutt. Gen. 1: 23. 1818. 
Similar to the preceding species in size and 
foliage, or the leaves rather narrower, some- 
times wavy-margined. Flowers blue; perianth- 
tube only %/’-1’ long, shorter than the bracts 
and the sometimes yellowish perianth-segments, 
somewhat expanded upward; capsule ovoid, 
about 8’ high, borne on a pedicel of about its 
own length. 
Shores of Lakes Huron and Superior. Local. 
Reported from the following localities: Presque 
Isle, Mackinac City, Bois Blanc Island and Drum- 
mond’s Island, Mich.; Bruce Peninsula and South- 
ampton, Ont. May. 
