Okder 147.— the thilliads. 293 



IRIS, riower-de-luce. 

 Perianth 6-parted, the 3 outer divisions (sepals) reflexed, or spreading, 

 the 3 inner (petals) erect. Stamens 8, distinct. Style short. Stigmas 8, 

 petal-like, covering the stamens. — Perennial herhs 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 ilowera. . . .a 



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



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 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 

 o Sepals and petals beardless, but sometimes with a crest. . . .5-7 



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



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



2 I. versic'olor. JBhte Flag. Stem 1-angled. Flowers blue-yellow-white. Fet- 

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

 4 I. ou'prea. Gopper-coVd I. Stem terete. FIs. orange-yellow. Sepals notched. S. 



5 I. laous'tris. Lahe L Scape 1- flowered, flower blue and yellow. Lvs. lance. W. 



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



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



shaped. Pod 6-angled. + 



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



Leaves lanceolate, 3' long. S. [obtuse. Leaves ensiform, t 



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

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



Stigmas jagged. + 



II I. sambuci'na. Common Flower-de-t'jce. 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,Bpathes also 



colored, r. t 



13 I. Susia'na. Chalcedonian IrU. Stem 1-flowered, fl. striped. Petals deflexed. t 



Order CXLYII. TRILLIACEiE. The Trilliads. 



Herbs with tuherous roots, simple stems, and whorled, net-veined leaves j 

 with th& 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 

 ovary free, 3-5-celled, becoming in/rwif a juicy, many-seeded ^oi. 



