Order 147.— THE TiULLIADS. 293 



IRIS. Flower-de-luce. 



Perianth G-parted, the 3 outer divisions (sepals) reflexed, or spreading, 

 the 3 inner (petals) erect. Stamens 3, distinct. Style short. Stigmas 3, 

 petal-like, covering the stamens. — Perennial herbs with thick roots or 

 rootstocks, sword-shaped or grass-like leaves, and large showy flowers. 

 April- July. 

 § Stems leafy, tall (l-2f. high), mostly bearing several flowers. . . .a 



§ Scapes leafless, low (1-6' high), mostly bearing but 1 flower c 



a Sepals or perianth bearded. Cultivated exotics in gardens, &c 11-18 



a Sepals and petals beardless. "Wild plants, hardly ever cultivated b 



b Leaves linear, grass-like, less than half an inch \vide....l 

 b Leaves sword-shaped, nearly 1 or 2'' wide. . . .2-4 



c Sepals or perianth bearded, beard crested or not crested. . . .8-10 

 c Sepals and petals beardless, but sometimes wuth a crest. . . .5-7 



I I. Virgin'ica. Boston I. Stem slender. Ovary and pod acute, sides 2-grooved. 



Flowers yellow-blue. E. [als obtuse, large, c. 



2 I. versic'olor. Blue Flag. Stem 1-angled. Flowers blue-yellow-white. Pet- 



3 I. tripet'ala. Stem terete. Flowers blue. Petals very small, 3-toothed. S. 



4 I. cu'prea. Copper-coV d I. Stem terete. Fls. orange-yellow. Sepals notched. S. 



5 I. lacus'tris. Lake I. Scape 1-flowered, flower blue and yellow. Lvs. lance. "W. 



6 I. ver'na. Early I. Scape 1-flowered, flower blue. Leaves linear, very long. S. 



7 I. ochroleu'ca. Cream-colored I. Scape 3-flowered, flowers yellow. Lvs. sword- 



shaped. Pod G-angled. t 



8 I. crista'ta. Crested I. Scape 1-flowered, 2-4' high, flower blue and yellow. 



Leaves lanceolate, 3' long. S. [obtuse. Leaves ensiform. f 



9 I. pum'ila. Dwarf I. Scape 1-flowered, 6-10' high, flower deep blue. Petals 

 10 I. Chinen'sis. China I. Scape many-flowered, flattened, flowers pale blue. 



Stigmas jagged. + 



II I. sambuci'na. Common Flower-de-luce. Stem many-flowered, flowers blue or 



whitish. Petals and sepals notched, c. + 



12 I. German'ica. German F. Stem many-flowered, flowers deep blue, spathes also 



colored, r. t 



13 I. Susia'na. Clialcedonian Iris. Stem 1-flowered, fl. striped. Petals deflexed. r 



Order CXLYII. TRILLIACE.E. The TriUiads. 



Uerhs with tuberous roots, simple stems, and whorled, net-veined leaves, 

 with the Jlowers one or few, terminal, and mostly 3-parted; with the 

 sepals green, and the petals more or less colored ; with the 

 stamens 6-10, awl-shaped filaments and linear anthers; with the 

 ozary free, 3-5-celled, becoming m fruit a juicy, many-seeded ^o<?. 



