342 ONAGRACEAE (EVENING PRIMROSE FAMILY) 



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

 late. Oenothera in part. 



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

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

 the internodes 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-denticulate 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, ob ovoid-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 

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

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

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



