:\\'2 ONAGRACEAE (EVENING PRIMROSE FAMILY) 



gated, narrowed at the base, more or less curved. Seeds sometimes tubercu- 



late. Oenothera in part. 



1. Galpinsia lavandulaefolia (T. & G.) Small, Fl. S. E. U. S. 845. 1903. 

 Stems copiously tufted, radially spreading and seldom rising more than 1 dm., 

 the iiiternodes very short: leaves very numerous and crowded; blades linear 

 or linear-spatulate, on the lower part of the stem entire or essentially so, 

 finely but closely pale-pubescent: flowers few: calyx-tube elongated, rather 

 gradually dilated, lobes 10-16 mm. long: petals 12-18 mm. long: capsules 

 narrow, 2-2.5 cm. long. Oenothera Hartwegii lavandulaefolia. Wyoming to 

 New Mexico. 



11. MERIOLIX Raf. 



Biennial or perennial herbs with branched stems, or sometimes shrubby. 

 Leaves alternate, narrow, entire or sharply serrate. Flowers regular, axil- 

 lary, yellow. Calyx-tube funnelform, shorter than the ovary. Calyx-segments 

 keeled on the back. Petals often blotched at the base. Stigma disk-like, 

 4-toothed. Capsules linear, 4-angled, sessile. Seeds longitudinally grooved. 

 Oenothera in part. 



1. Meriolix serrulata (Nutt.) Walp. Repert. 2: 79. 1843. Stems often co- 

 piously branched at the base, the branches canescent, 1-5 dm. high: leaf- 

 blades spatulate to linear-oblong or linear, 2-5 cm. long, serrate: calyx-tube 

 3-4 mm. broad at the mouth, the free portion yellow within: sepals 5-7 mm. 

 long: petals obovate, 8-12 mm. long, crenulate: anthers 2.5-3 mm. long: 

 capsules linear-cylindric, 1.5-2 cm. long, about 1.5 mm. thick. From Mani- 

 toba to New Mexico and Texas. 



12. TARAXIA Nutt. 



Acaulescent plants with pinnatifid or entire leaves and yellow or white 

 axillary flowers. Calyx 4-parted, the tube filiform, longer than the ovary, 

 marcescent or tardily deciduous. Petals 4, deciduous. Stamens 8, erect; 

 anthers oval or oblong and fixed near the base, or linear and fixed near the 

 middle. Style usually adherent to the calyx-tube; stigma capitate, entire 

 or rarely 4-toothed. Capsule sessile. Oenothera in part. 



Leaves pinnatifid 1. T. breviflora. 



Leaves subentire or repand-cienticulate . . . . . . . 2. T. subacaulis. 



1. Taraxia breviflora Nutt. in T. & G. Fl. 1: 506. 1840. Stemless, minutely 

 pubescent or somewhat canescent: leaves lanceolate, interruptedly pinnati- 

 fid, somewhat petioled; the segments short, 1-2-toothed or entire: flowers 

 (small) scarcely longer than the petioles: tube of the calyx subulate, rather 

 longer than the linear-lanceolate segments: style shorter than the calyx- 

 segments: capsules ovoid-oblong, deeply 4-grooved, subulate with the per- 

 sistent calyx-tube. Utah and Wyoming to Northwest Territory. 



2. Taraxia subacaulis (Pursh) Rydb. Mem. N. Y. Bot. Gard. 1: 281. 1900. 

 Glabrous perennial: leaves oblong-lanceolate, tapering into a slender petiole, 

 entire or repand, 5-10 cm. long: tube of the calyx much shorter than the 

 leaves, the segments linear-lanceolate: petals broadly obovate, retuse: cap- 

 sule 15-20 mm. long, obovoid-oblong, tetragonal, attenuate above into the 

 persistent calyx-tube, the sides nearly flat, ribbed, sub reticulated : seeds 

 numerous, minutely pitted. From Colorado and Wyoming to Oregon. 



13. SPHAEROSTIGMA Nutt. 



Annual or perennial herbs with erect branching or spreading stems, the 

 [-irk often exfoliating and shiny. Leaves alternate, entire or dentate, pet- 

 ioled or sessile. Mowers solitary in the axils or in terminal spikes, usually 

 yellow, rarely white or rose-color, often with a brownish spot at the base, 





