Znui^chneria. ONAGRACE/K. 



217 



TiUBE 111. nAURINEiE. Linil) or pnnliiccd tube of the ciilyx deciduous from tlie dry and 

 indehiscent 1 - 4-seeded fruit. Parts of the (lower in fours or rarely threes. Leaves alternate. 



12. Gaura. Stamens 8, nil perfect : anthers attached by the middle, versatile. 



13. Heterogaura. Fertile stamens 4, with anthers atta(,'hcd at the base ; sterile stamens before 



the petals 4. 



Tribe IV. CIRCiEE/E. I>imb of the calyx deciduous from the iiidehi.scent bur-like 1-2- 

 seeded fruit. Parts of the flowers in twos throughout. Leaves opposite. 



14. Circeea. The only genus. 



1. JUSSI^A, Linn. 



Calyx-tube not prolonged above the elongated ovary, the 4 to 6 herb.aceous lobes 

 persistent. Petals as many, obovate, spreading, yellow. Stamens 8 to 12. Ovary 

 4 - 6-celled : style simple : stigma capitate, 4 - 6-grooved. Capsule clavate, 4-6- 

 valved, dehiscing septicidally, or soraewhtit irregularly bctweeti the ribs, many- 

 seeded. Seeds in several rows in each cell (or in one row in the following species, 

 and surrounded by a thick epicarp), naked. — Aquatic or marsh herbs; leaves entire, 

 altcrnato, with very small stipules ; flowers solitary, axillary, usually on 2-bracteo- 

 lato pedicels. 



Species about 40, belonging mostly to Tropical America. 



1. J. repens, Linn. Perennial, glabrous or puberulent : stems creeping and 

 rooting at base, 1 or 2 feet long, the branches ascending : leaves oblanceolate or 

 elliptical, 1 to 3 inches long, rather obtuse, tapering below into a long slender peti- 

 ole : flowers nearly an inch broad : stylo stout, hairy : caj)sulo 1 to U inches long, 

 nearly t(;rcte, 1^ lines broad: pedicels 1 to 2 inches long, bractod : "seeds in one 

 row, covered by a thick white spongy adherent epicarp. 



Var. Californica, Watson. Flowers smaller, G to 8 lines broad : style slender, 

 glabrous : capsule smaller, 8 to 10 lines long, 2 lines broad : pedicels shorter, 4 

 to 6 lines long : seeds slightly larger. 



Cedar Lake, Cache Creek (Bolandcr) ; Northern Sonora (Coulter, Thurhrr) ; the variety only, 

 which is probably to be regarded as a distinct species. Forms of the Linnean species are of wide 

 range on the eastern side of the continent and also occur in the East Indies. 



2. LUDWIGIA, Linn, 



Calyx-tube not produced beyond the short ovary, the 4 lobes usually persistent. 

 Petals 4, often small or wanting. Stamens 4 ; fdaments short. Capsule short or 

 cylindrical, many-seeded, 4-valved, dehiscent septicidally or by openings at the sum- 

 mit. Seeds minute. — Aquatic or marsh perennials ; leaves entire (opposite in our 

 species) ; flowers axillary, mostly solitary and sessile. 



About 20 species, mostly North American, a few belonging to the Old World. A single specie.s 

 is native to the Western Coast, of rare occurrence. 



1. L. palustris, Ell. Smooth, creVping or floating: leaves all opposite, ovate 

 or oval, ^ to 1 inch long, tapering to a short i>etiole, acute : flowers solitary, sessile: 

 petals none or short and reddish : capsule short-oblong, 2 lines long or less, some- 

 what 4-angled. 



Sierra Co. {Lemmon) ; Oregon {Douglas, Hall) ; and on the Atlantic side from the Saskatcha- 

 wan and Canada to the Gulf of Mexico : also in Europe. 



3. ZAUSCHNERIA, Presl. 

 Tube of the calyx funnolform and deeply colored above the ovary, with a small 

 globose base and a 4-lobed limb, deciduous, appendaged within with 8 small scales, 



