ONAQRACL^E. 115 



fioWn nnd tniff places; common. Juno. Aug. S/em 2 to 5 feet high, simple 

 or branching from tlie base. Leaves 3 to 6 inches long, ]4 to 1^ wide, roughly 

 pubescent: radical one* tapering into a petiole. Flowers numerous, liuht-yeHow, 

 fragrant, opening after sunset and closing next day, in a spike 3 to 12 inches long. 



2. (E. fruticosa, L. Swndrops. Per. Eve' g Primrose. 



Stem erect, simple or nearly branched, pubescent or hirsute; hares oblong or 

 lanceolate, slightly toothed; petals broadly obcordate, longer than the calyx-lobes 

 and stain us : tosh ok obleng-club-snaped, 4-winged, longer than the pedicels. 



Open places; common. June — Aug. Per. Stem hard, rigid, 1 to 3 feet high, 

 branched, i - variable in pubescence, form and size. Flowers large, 



V/2 inches in diameter, bright yellow, in a peduncled corymb. 



3. (E. PTTMILA, L. Dwarf Evening Primrose. 



Low, pubescent; stem ascending; haves lanceolate or oblaneeolate. mostly obtuse, 

 attenuate at base, entire; flowers in a loose and prolonged leafy raceme; petals 

 obcordate. scarcely longer than the stamens. 



Dry fields. July, Aug. Biennial. A small half-erect plant, C to 10 inches long, 

 with a round, slender simple stem. Leaves 1 to 1% inches Ionjr. }.£ to % inch 

 wide; radical ones spatuiate, petiolate. Flowers yellow, \4, inch broad, opening in 

 succession, 1 or 2 at a time. Cbpsule oblong-club-shaped, nearly sessile, S-anglcd. 



GAURA. Linn. 



Gr. gauros, superb ; on account of the showy flowers of some species. 



Calyx-tube much prolonged beyond the ovary, deciduous; 

 limb 4-cleft, renexed. Petals 4, clawed, somewhat unequal, 

 ted into the tube. Stamens 8, decimate. Style long. 

 Stigma 4-lobed. Fruit 4-angled, dry and indehiscent, by 

 abortion mostly 1-celled, 1 to 4-seedcd. Seeds naked. — 

 Herbaceous or shrubby plants, with alternate haves and rose- 

 color or white changing to red flowers, in wand-like spikes or 

 racemes. 



G. BIENNIS, L. Biennial Gaura. 



Whole plant softly hairy or downy; haves lanceolate, remotely dentate, alt«> 

 nat, sessile \ flowers numerous, Bessile, in terminal spikes ;/>•?<,£ sub-sessiic, 8-ribbed, 

 pubescent. 



Banks of streams. July, Aug. A handsome biennial 3 to 5 feet high. Leaves 

 pale green, acute at each end. ( alfx reddish. Corolla rose-color, changing to deep 

 pely with more than one mature seed. 



LUDWIGIA. Linn. 



In honor of C. D. Ludiciff, Prof, of Botany at Leipsic, about 1750. 



Calyx-tube not prolonged beyong the ovary; limb 4-lobed, 

 usually persistent. Petals 4, equal, obcordate, oiten small 

 or wanting. Stamens 4, opposite the apex. Style short. 

 Capsule short, 4-celled, 4-valved, many-seeded and crowned 

 with the persistent calyx lobes. — Perennial herbs, with entire 

 mostly alternate leaves and axillary flowers, often yellow or 

 apetalous. 



