Jones: Flora of Illinois, 115. Onagraceae 191 



4. Stem glabrous; bractlets subulate; capsules longer than the calyx-lobes; 



muddy shores, local. July-Sept L. polycarpa Short & Peter 



4. Stem pubescent; bractlets minute, or none; capsules not longer than 



the calyx-lobes; muddy shores, s. 111., rare.July-Sept 



L. sphaerocarpa Ell. 



4. Oenothera L. — Evening-primrose 

 1. Leaves not linear-filiform; stigma 4-lobed. 



2. Calyx-lobes reflexed; stamens equal in length; flowers more or less noctur- 

 nal; petals yellow; capsules terete or round-angled; plants biennial or 

 annual. 

 3. Capsules lanceloid-cylindrical, 4-7 mm. thick at maturity, slightly ta- 

 pering from a thickish base; flowers many, in a terminal spike; leaves 

 repand-denticulate; petals 1-2 cm. long, obovate; dry soil, common. 



June-Oct. Common Evening-primrose O. biennii L. 



3. Capsules linear-cylindrical, 2-3 mm. thick, essentially uniform in diam- 

 eter throughout. 

 4. Upper and median leaves remotely denticulate to entire; flowers 

 many, in a terminal spike; petals 12-25 mm. long, rhombic-ovate; 

 capsules 1-2 cm. long, strigose; sandy soil, local, chiefly in the n. 

 half of 111., but extending southw. near the Mississippi R. June- 

 Sept. [^Raimannia rhombipetala (Nutt.) Rose} 



O. rhombipetala Nutt. 



4. Upper and median leaves sinuately dentate or pinnatifid; flowers few, 

 axillary; petals 5-12 mm. long, obovate; capsules 2-3 cm. long, 

 pilose; sandy soil, chiefly in the s. half of the state, extending 

 northw. to Peoria Co. May-July [RaitJiannia laciniata (Hill) Rose; 



O. sinuata L.] O. laciniata Hill 



2. Calyx lobes erect or ascending, cohering in pairs; stamens unequal in 

 length, the alternate ones somewhat longer; flowers diurnal; capsules 4- 

 angled; plants perennial. 

 5. Petals yellow; capsules 4-winged; leaves entire or denticulate. 

 6. Stem erect; petals 1.2-2.5 cm. long; capsules 1.5-2 cm. long. 



7. Capsules sparsely pilose, the hairs glandless; leaves lanceolate, 

 hirsute on both surfaces; stem pilose; roadsides and fields, not 

 infrequent. June-Oct. [O. pratensis (Small) B. L. Robins.; 

 Kneiffia pratensis Small} Common Sundrops ...O. pilosella Raf. 

 7. Capsules with a few gland-tipped hairs; leaves linear-oblanceolate, 

 strigose; stem short-pubescent; dry soil, rare; Karnak, Pulaski 



Co., McDougall [O. fruticosa sensu auth., non L.} 



O. tetragona Roth 



6. Stem decumbent, strigilose; petals 5-7 cm. long; hypanthium 5-15 

 cm. long; capsules 5-8 cm. long, 4-6 cm. wide; sandy or rocky soil, 

 rare, s.w. 111.; St. Clair Co., Muljord; Washington Co., Vasey 



[Megapteriutn missouriense (Sims) Spach} 



O. missouriensis Sims 



5. Petals white or pink, 2.5-4 cm. long; buds nodding; capsules 4-angled 

 and ribbed, canescent-strigose, stipitate; leaves dentate to pinnatifid. 



