58 ONAGRACEAE. 



sules oblong", pubescent or hirsute, sessile, seeds prismatic-angled. Fields 

 and waste places; .July-September; common. (Onagra biennis (L.) Scop.) 



OE. rhombipetala Nutt. Stem 1-4 feet high; simple, appressed pubes- 

 cent: leaves narrowly lanceolate to linear, entire or denticulate, the lowest 

 tapering to a petiole; flowers in a leafy or bracted spike; calyx silky canes- 

 cent; petals rhombic-ovate; capsules linear; seeds obovoid, not angled. 

 Sandy soil, prairies; July-September; Muscatine county, reported from 

 Fayette, Story, and other counties, often confused with the preceding. 



OE. fruticosa L Sundrops. Biennial or perennial; stem 1-3 feet high, 

 branched, villous to nearly glabrous; leaves oblong-lanceolate, entire or den- 

 ticulate: flowers in a loose corymb; capsule short-pedicelled, ribbed and 

 winged. Low grounds; June-August; infrequent; Muscatine, Johnson, and 

 Henry counties. (Knciffia fruticosa (L.) Raimann.) 



OE. serrulata Nutt. Stem 6-16 inches high, perennial, woody below, 

 canescent or glabrous; leaves mostly linear or lanceolate, irregularily and 

 sharply denticulate; flowers axillary; calyx-tube funnelform, nerved; petals 

 obovate, crenulate. Dry soil, pastures and waysides; June-July: frequent: 

 Winneshiek, Allamakee, Fayette, Story, Shelby, Fremont, Cerro Gordo, Han- 

 cock, Dickinson, Ida, Emmet, Sioux, Woodbury, and Lyon counties, (MerUMx 

 serrulata (Nutt.) Walp.) 



GAURA L. Leaves alternate, sessile. Flowers white or rose-color, in 

 spikes or racemes. Calyx-tube much prolonged beyond the ovary, deciduous; 

 calyx-lobes 4, reflexed. Petals 4, unequal, clawed. Stamens usually 8. 

 Stigma 4-lobed. Fruit nut-like, indehiscent, 1-celled, 1-4-seeded. 



G. biennis L. Stem 3-6 feet high, much branched, villous or downy-pube- 

 scent; leaves oblong-lanceolate or lanceolate, remotely denticulate; flowers 

 sessile, white, turning pink, in numerous slender spikes; fruit sessile. 4- 

 ribbed, oval or oblong, villous pubescent. Fields and waste places; July- 

 September; common. 



G. coccinea Pursh. Stem 6-20 inches high, erect or ascending, much 

 branched, canescent, pubescent or glabrate; leaves oblong-lanceolate to 

 linear-oblong, entire, repand or denticulate; flowers sessile, red, turning 

 scarlet; fruit sessile, terete below, 4-sided above, canescent. Dry soil. 

 prairies; May-August; frequent; Woodbury, Harrison, Monona, and Fremont 

 counties. 



G. parviflora Dougl. Stem 2-6 feet high, villous-pubescent: leaves ovate- 

 lanceolate, acuminate, repand-denticulate, base narrowed, softly pubescent; 

 flowers many, pink, sessile, in an elongated spike; fruit sessile, 4-nerved. 

 obtusely 4-angled, glabrous or nearly so. Meadows and fields; May-August; 

 frequent; Woodbury, Harrison, Pottawattomie, and Fremont counties. 



CIRCAEA L. Perennials, with opposite petioled thin leaves, and small 

 whitish racemose flowers. Calyx-tube slightly prolonged, the end filled by a 

 cup-shaped disk, deciduous. Petals 2, obcordate. Stamens 2. Fruit small, 

 bur-like, indehiscent, clothed with white hooked hairs. 



C. lutetiana L. Stem simple, 1-2 feet high; leaves ovate, long-petioled, 

 base rounded, acuminate, entire or slightly toothed; bracts none; fruit 2- 

 celled. Blender pedicel led, bristly. Rich woods; June-August; common. 



C. alpina L. Stem weak. 3-9 inches high; leaves cordate, thin, shining, 

 coarsely toothed: bracts minute; fruit 1-celled, obovate-oblong, soft hairy. 

 Rich woods: June-August; infrequent; Winneshiek, Clayton, and Muscatine 

 counties. 





