GENUS 8. 



EVENING-PRIMROSE FAMILY. 



597 



i. Raimannia humifusa (Xutt.) Rose. Seaside 



Evening-Primrose. Fig. 3042. 

 Oenothera humifusa Nutt. Gen. i : 245. 1818. 



Oenothera sinuata var. humifusa T. & G. Fl. N. A. 1 : 494. 

 1840. 



Raimannia humifusa Rose, Contr. Nat. Herb. 8: 331. 1905. 



Spreading and decumbent or ascending, branched 

 from the base and usually also above, silvery-pubescent 

 with white appressed or ascending hairs; stems 8'-i8' 

 long. Leaves lanceolate to oblanceolate, sessile or nar- 

 rowed into a petiole, acutish or sometimes obtuse at the 

 apex, i'-2' long, repand-denticulate, the lower pinnatifid ; 

 flowers axillary, yellow, nocturnal, 6"-is" broad; calyx- 

 lobes linear, obtusish, shorter than the tube, somewhat 

 spreading; capsule linear, 6"-i2" long, about li" thick, 

 very pubescent ; seeds striate longitudinally. 



On sea-beaches, New Jersey to Florida. Bermuda. June- 

 Sept. 



2. Raimannia laciniata (Hill) Rose. Cut-leaved Evening-Primrose. 



Fig. 3043- 



Oenothera laciniata Hill. Veg. Syst. 12: 64. 1767. 

 Oenothera sinuata L. Mant. 2 : 228. 1771. 

 Oe, minima Pursh, Fl. Am. Sept. 262. pi. 15. 1814. 



R. laciniata Rose, Contr. Nat. Herb. 8: 330. 1905. 



Decumbent or ascending, simple or sometimes 

 branched, 4'-2i high, glabrous or sparingly hirsute- 

 pubescent. Leaves sessile or the lower petioled, 

 oval-lanceolate or oblanceolate, acute or obtusish at 

 the apex, sinuate-dentate or often pinnatifid, i'-2' 

 long; flowers axillary (or on small plants some- 

 times solitary and terminal), 6"-2' broad; calyx-lobes 

 linear-lanceolate, reflexed, much shorter than the 

 slender tube; capsule linear, i'-ij' long, about i" 

 thick, more or less pubescent, straight or curved 

 upward ; seeds strongly pitted. 



In sandy dry soil, southern New Jersey to Pennsyl- 

 vania, Illinois and South Dakota, Florida, Texas and 

 Mexico, extending into South America. Bermuda. May- 

 June. Naturalized in Vermont. 



Raimannia grandis (Britton) Rose, with large 

 flowers, found from Missouri and Kansas to Texas, is 

 probably a race of this species. 



3. Raimannia rhombipetala (Nutt.) Rose. 

 Rhombic Evening-Primrose. Fig. 3044. 



Oenothera rhombipetala Nutt. ; T. & G. Fl. N. A. I : 

 493. 1840. 



R. rhombipetala Rose, Contr. Nat. Herb. 8 : 330. 

 1905. 



Erect, simple or rarely branched, finely and 

 densely appressed pubescent, 2-4 high. Leaves 

 linear-lanceolate, sessile and rounded at the base 

 or the lower narrowed into petioles, acuminate at 

 the apex, remotely denticulate, 2 '-4' long; flowers 

 in terminal, leafy-bracted spikes, yellow, nocturnal, 

 I '-2' broad, calyx-lobes linear, reflexed, canescent, 

 shorter than the very slender tube ; petals rhombic- 

 obovate ; capsule columnar, curved upward, pubes- 

 cent, 6"-8" long, about i" thick; seeds obovoid, 

 tuberculate at the top. 



On prairies, Minnesota to Indiana, Nebraska and 

 Texas. June-July. 



