“LUDWIGIA, ONAGRACE. 221 
= = Stigma entire or rarely 4-toothed: ovaries and capsule sessile 
or nearly so. 
7. Taraxia. Stigma capitate: calyx-tube longer than the ovary, usually 
adherent to the style. 
8. Spherostigma. Stigma capitate: calyx-tube campanulate, shorter 
than the ovary. 
Bet = ee tee Stigma capitate, ovules and capsule long-stalked.. 
9. Chylismia. Calyx-tube somewhat funnel-form, many times shorter 
than the ovary. 
++ ++ Flowers irregular: the alternate stamens longer. 
10. Pachylophus. Plants normally acaulescent: ovules and seeds few, 
sessile: seeds with a deep furrow along the raphe. 
+ + Anthers attached at or near the base, remaining erect; those 
opposite the petals much shorter or sterile, rarely wanting; petals 
never yellow. 
11. Godetia. Calyx-tube above the ovary obconical, its lobes reflexed. 
Petals sessile, entire, rarely 2-lobed. Capsule coriaceous. Seeds nu- 
merous angled or margined. 
12. Boisduvalia. Calyx-tube above the ovary obconical, its lobes erect. 
Petals sessile, 2-lobed. Capsule membranaceous, the cells few-seeded, 
seeds smooth. 
18. Clarkia. Calyx-tube above the ovary obconical; its lobes reflexed. 
l’etals with claws either lobed or entire: the stamens opposite them 
often sterile. Capsule coriaceous. 
Tripe III. -Gaurinex. Limb or produced tube of the calyx 
deciduous trom the dry and indehiscent 1—4-seeded fruit. Parts 
of the flowers in 4’s or rarely %’s. Leaves alternate. 
14. Gaura. Stamens 8, all perfect. Anthers attached by the middle, 
versatile. 
15. Heterogaura. Fertile stamens 4 with anthers attached at the hase, 
sterile stamens 4 oppositd the petals. 
Tripp LV. CrrcaEa. Limb of the calyx deciduous from the 
indehiscent burr-like 1-2-seeded fruit. Parts of the flowers in 
2’s throughout. Leaves opposite. 
16. Cirerxa. Small perennial herbs with opposite petioled leaves. 
LUDWIGIA L. Gen. n. 153. 
Calyx-tube not produced beyond the short ovary, the 4 lobes 
usually persistent. Petals 4 often small or wanting. Stamens 
4; filaments short. Capsule short or cylindrical, many-seeded, 
4-valved, dehiscent septicidally or by openings at the summit. 
Seeds minute. Aquatic or marsh perennials; leaves entire (op- 
posite in one species); flowers axillary, mostly solitary and 
sessile. 
-L. palustris Ell. i, 211. Stems creeping and rooting in the mud or 
floating, 4-12 inches long or mere: leaves all opposite, ovate or oval, 6-12 
lines long tapering to a short petiole acute: flowers solitary, sessile: petals 
none or short anu reddish: capsule short-oblong 2 lines long or less some- 
