Gentian Family. 109 



July; rare; Emmet county; .reported from Fayette. Story, and Woodbury 

 counties. 



t f Leaves varying /com narrowly lanceolate to linear. 



A. verticillata L.' Stems simple, 2-3 feet high; leaves 3-U in a whorl, 

 sometimes scattered, sessile, very narrow, linear, margins revolute: umbels 

 small, lateral or terminal; corolla greenish white; horns exserted; follicles 

 slender, erect, glabrous. Dry wooded hills; July-August; common. 



ACETATES Ell. GrKen Milkweeds.' Perennials. Hoods without horns. 

 Flowers greenish, in close umbels. 



A. longifolia Ell. Stem 2-3 feet high, roughish-pubescent, leafy; leaves 

 3-7 inches long, linear, sessile, scattered; umbels lateral, peduncle and pedi- 

 cels about equal in length. Fields and prairies; July-September; frequent. 

 (A. florkhtiai (Lain.) Hitchcock). 



A. tfiridifloia (Raf.) Eaton. Stem 1-2 feet high, whitish-pubescent; leaves 

 oppos'te, oval, oblong or ovate, short-petioled or sessile; umbels lateral, 

 short-peduncled or sessile. Prairies; June-September; frequent. Variable: 

 one of its forms, the variety t.anceoi.ata Gray, has lanceolate leaves and is 

 found with the typical form. 



A. lanuginosa Decaisne. Low, hairy: umbel solitary, terminal. Ue- 

 ported from Plymouth county. 



GENTTANACEAE Dnmort. Gentian Family. 



Herbs, with a watery bitter juice, opposite, rarely alternate, simple, 

 sessile entire exstipulate leaves, and regular, solitary or cymose flowers. 

 Stamens as many as the lobes of the corolla, and alternate with them. 

 Ovary superior, 1-celled, with 2 parietil placentae. Fruit a 2-valved 

 inanv-seedecl capsule. 



GENTIAN A L. Genthn. Leaves simple, sessile, opposite. Calyx 4-r>- 

 cleft. persistent. Corolla 4-.">-cleft, funnel-form or earapanulate, sinuses usu- 

 ally appendaged. Stamens inserted on the corolla. Stigmas 2. sessile or 

 nearly so. 



* Corolla with no plaits or teeth in the sinuses. 



G. crinita Froel. Friu<jeil (1. Annual, 1-2 feet high; stem and branches 

 erect, smooth: leaves lanceolate, acute, base somewhat cordate; flowers blue, 

 large, on long terminal peduncles, mostly in 4"s; corolla-tube as long as the 

 ovate acute calyx-lobes; corolla-lobes obovate, fringed. Wet places: Septem- 

 ber-October; infrequent: Muscatine, Johnson, Linn, and Chickasaw counties; 

 reported from Fayette, Story, and Hamilton counties. 



G. quinquefolia L. Annual; stem 1-2 feet high. 4-angled, branched: 

 leaves ovate-lanceolate, partly clasping; Sowers smaller than those of the 

 preceding species, peduncled, usually S in a cluster, pale blue, corolla-lobes 

 bristle pointed. The type has the calyx-lobes very, small, lance-linear. The 

 common form with us is the variety ocoid nt'ai.is Gray, which has the. calyx- 

 lobes leaf-like, half as long as the corolla. Moist soil, woods; August-Octo- 

 ber; Winneshiek, Johnson, Jefferson, Henry, and Hancock counties; reported 

 from Fayette, Muscatine, Story, and Emmet counties. 



* * Corolla with toothed or toheel i>laiU in the sinuses. 



G. puberula Mx. Stem about one foot high, roughish, leafy; leaves linear- 

 lanceolate, thick; flowers clustered; calyx-lobes narrowly lanceolate; corolla 

 blue, 2 or 3 times the length of the calyx, the lobes ovate, spreading; sinuses 

 of the corolla with cut-toothed appendages. Prairies: August-September: 



