the lobes subequaK the sinuses naked in ours; corolla greenish or whitish to 

 purple or violet, or white and marked with violet, deciduous, campanulate to 

 subpelviform, divided to the middle or below, longer than the calyx; stamens 

 exserted, equal and equally inserted on the corolla; appendages linear, a pair 

 bordering each filament, one edge free, ciliate; style exserted, shallowly bifid; 

 mature capsules membranaceous, unilocular, loculicidally dehiscent; ovules a 

 pair on the front of each of the 2 large parietal placentae; seeds 1 to 3, subglobose, 

 brown, reticulate. 



About 8 species in the United States and Canada. 



1. Distribution eastern Oklahoma eastward 1. H. virginianum. 



1. Distribution New Mexico and/or Arizona westward (2) 



2(1). Leaflets acuminate, the teeth usually 8 to 12 and acuminate; cymes lax in 

 fruit 2. H. Fendleri. 



2. Leaflets obtuse to abruptly acute, the teeth usually 3 to 6 and obtuse to acute; 



cymes compact in fruit 3. H. occidentale. 



1. Hydrophyllum virginianum L. 



Perennial to about 8 dm. tall, the upper portion of stem, cymes, pedicels and 

 back of sepals sparsely to densely strigose with appressed to ascending hairs to 

 about 0.5 mm. long; cauline leaves broadly ovate to broadly triangular in outline, 

 1-2 dm. long and a little wider, pinnately lobed almost to the midrib; leaf seg- 

 ments 5 to rarely 9, the terminal one and the basal pair often 2- or 3-lobed, all 

 with acute to acuminate apices and strongly ascending teeth; cymes very dense at 

 anthesis; sepals sparsely hirsute-ciliate; corolla white to pale-pink-purple, 7-10 

 mm. long; stamens long-exserted. 



Wet meadows, moist or wet woodlands and open wet places generally, in 

 Ozarkian Okla. (Waterfall) , Apr.-June; Que. to N.D., s. to Va., Ky., Okla. and 

 Kan. 



2. Hydrophyllum Fendleri (Gray) Heller. Fig. 647. 



Perennial to about 8 dm. tall, the stems retrorse-hispid, the rhizome bearing 

 fleshy-fibrous roots; leaves petiolate, oblong to oval, 6-30 cm. long, 6-20 cm. 

 broad, pinnatifid, the principal divisions usually 9 to 13, ovate to lanceolate, 

 acuminate, 2-12 cm. long, the lower pairs usually distinct, the upper confluent, 

 all coarsely serrate to incised with ovate-lanceolate lobes, strigose on both 

 surfaces; cymes one to several, open; pedicels 2-6 mm. long; calyx lobes linear- 

 lanceolate, 4-6 mm. long, 1-2 mm. wide, sparsely strigose and often hispid on the 

 back, ciliate with flattened hyaline hairs, nearly equaling the corolla; corolla 

 white or yioiet, or white and marked with violet, 6-8 mm. long, the lobes 3-4 mm. 

 long; style exsened 5-7 mm.; capsules about 4 mm. in diameter; seeds 1 to 3, 

 light brown, 2.5-3 mm. in diameter. 



Moist shaded soil, in water of marshes and in seepage along wooded streams, 

 in N. M. (Taos, Rio Arriba, Santa Fe, San Miguel, Otero and Socorro cos.), May- 

 Sept.; Wyo., Ida., Wash, and Ore., s. to Calif., Ut. and N. M. 



3. Hydrophyllum occidentale (Wats.) Gray. 



Perennial to about 6 dm. tall, the stems densely short-pubescent to somewhat 

 retrorse-hispid, the rhizome bearing fleshy-fibrous roots; leaves oblong, 3-30 cm. 

 long, 3-15 cm. broad, pinnatifid; principal leaf divisions 7 to 15, broadly oblong 

 to ovate, 1.5-7 cm. long, all incised or lobed (rarely entire) with ovate lobes, 

 strigulose on upper surface, paler on lower surface with dense fine subappressed 

 hairs; cymes one to several, globose; pedicels 2-5 mm. long; calyx lobes narrowly 

 lanceolate, 3-4 mm. long, 1-2 mm. broad, strigulose on the back, hispid-ciliate; 

 corolla violet to white, 7-10 mm. long, the lobes 4-6 mm. long, oblong; style 



1379 



