Zauschneria. ONAGRACE^. 917 



TiUBE III. GAUEINE.E Limb or produced tube of the calyx .le<aduous from the dry and 

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



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



13. Heterogaura. Fertile stamens 4, with anthers attached at the base : sterile stamens before 



the petals 4. 



Tribe IV CIRC^E^E. Limb of the calyx deciduous from the indcliiscent bur-like !-'>- 

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



14. Circaea. The only genus. 



1. JUSSIiEA, Linn. 

 Calyx-tube not prolonged above the elongated ovary, the 4 to G herbaceous lub(;s 

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

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

 valved, dehiscing septicidally, or somewhat irregularly between 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^ 

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

 late 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 asceiiding : leaves oblanceolate or 

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

 ole : flowers nearly an inch broad : style stout, hairy : capsule 1 to 1^ inclies Ion- 

 nearly terete, 11 lines broad: pedicels 1 to 2 inches long, bracted Tseeds in one 

 row, covered by a thick white spongy adherent epicarp. 



Var. Californica, Watson. Flowers smaller, 6 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, Thurber) ; 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 smaU or Avanting. Stamens 4 ; filaments 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 (ojiposite in our 

 species) ; flowers axillary, mostly solitary and sessile. 



_ About 20 species, mostly North American, a few belonging to the Old World. A sin<de species 

 IS native to the Western Coast, of rare occurrence. 



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

 or oval, 1 to 1 inch long, tapering to a short petiole, acute : floAvers solitary, sessile: 

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

 what 4-aiigled. 



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

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



3. ZAUSCHNERIA, PresL 

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

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



