ORDEK 147. THE THILLIADS. 315 



IRIS. Flower-de-luce. 



Perianth 6-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 

 rootstncks, sword-shaped or grass-like leaves, and large showy flowe-s. 

 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, <fee 11-18 



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



6 Leaves linear, grass-like, less than half an inch wide 1 



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 imd petals beardless, but sometimes with a crest.... 5-7 



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



Flowers yellow-blue. E. [ids 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, 8-toothed. S. 



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



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



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



7 I. ochrolen'ca. Crtum-colimd 1. Scape 3-flowered, flowers yellow. Lvs. sword- 



shaped. Pod 6-angled. t 



8 t crista'ta. Crested I. S.cape 1-flowered, 2-4' high, flower blue and yellow 



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



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

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



Stigmas jagged, t 



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



whitish. Petals and sepals notched, c. t 

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



colored, r. t 

 15 I. Snsia'na. Chalcedonian Iris. Stem 1-flowered, fl. striped. Petals deflexed. < 



ORDER CXLVII. TRILLIACE.E. The Trilliads. 



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

 with the flowers 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 

 otary free, 3-5-celled, becoming in fruit & juicy, many-seeded pod. 



