Order 147.— THE TiJLLIADS. 315 



IRIS. Flower-de-luce. 

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

 tlie 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 flower's. 

 April- July. 



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



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



a Sepals or perianth bearded. Cultivated exotics in gardens, &c 11-13 



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



b Leaves linear, grass-like, less than half an inch wide....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 with a crest 5-7 



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



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



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

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

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

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

 G 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 6-angled. t 



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



Leaves lanceolate, 3' long. S. [obtuse. Leaves ensiforni. 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-lzice. Stem many-flowered, flowers blue oi 



whitish. Petals and sepals notched, c. t 

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



colored, r. f 

 18 I. Susia'na. Chalcedonian Iris. Stem 1-flowered, fl. striped. Petals deflexed. ■ 



Order CXLYII. TRILLIACE.E. The Trilliads. 



Herls with tuberous roots, simple sterna, and whorled, net-veined leaves, 

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

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

 stamens 0-10, awl-shaped filaments and linear anthers; with the 

 oi:ary free, 3-5-celled, becoming m fruit a juicy, many-seeded joocZ. 



