82 EYDROPHYLLACE.E . (WATEELEAF FAMILY.) 



* Leaves simple and entire, or with a pair or two of similar and smaller leaflets or lobes. 



1. P. circinata, Jacq. f. A span to a foot or two high from a stout root, hispid and 

 the foliage strigose, either green, grayish or canescent, with a soft pubescence; leaves 

 from lanceolate to ovate, acute, the lower tapering into a petiole and some bearing lateral 

 leaflets; inflorescence in dense scorpioid hispid spikes, crowded; corolla dull or bluish 

 white; filaments much exserted. A very variable species; usually many stems from one 

 root; some with large entire, ovate green leaves only. 



2. P. Breweri, Gr. Foliage and habit similar to the last, but smaller and more 

 slender, from an annual root; leaves seldom an inch long, many of them 3-5-parted, the 

 lanceolate lateral lobes ascending; corolla smaller (scarcely 3 lines long), blue or violet; 

 filaments not exserted. 



* * Leaves simple, rounded, cordate, lobed and serrate. 



3. P. malv^folia, Cham. Stout, loosely branching, hispid with stinging hairs; 

 leaves 2 inches or more in diameter; spikes solitary, or in pairs; corolla 3 to 6 lines long, 

 dull white or bluish; stamens much exserted. 



* Leaves once to thrice pinnatifid or pinnately compound, oblong in general outline. 

 Calyx Iristly hispid, its lobes not rarely unequal. Annuals, the species difficult to dis- 

 criminate. 



4. P. tanacetifolia, Benth. Erect, 1 to 3 ft. high, roughish, hirsute or hispid; 

 leaves 9-17-divided in narrow once or twice pinnately parted or cleft divisions, all sessile 

 or nearly so; the scorpioid spikes clustered; the short pedicels erect or ascending; corolla 

 usually of a dirty mottled white or bluish; stamens and style much exserted; calyx lobes 

 not twice the length of the capsule. 



5. P. ramosissima, Dougl. Straggling, somewhat viscid above; leaves pinnately 

 5-7-divided or parted into linear pinnatifid-incised divisions; the short pedicels soon 

 horizontal; stamens and style moderately exserted; calyx lobes more than twice the 

 length of the globular capsule; flowers bluish. 



6. P. ciliata, Benth. A span to a foot high; leaves rarely divided but incised or 

 cleft and toothed; spikes simple or in pairs; stamens usually not surpassing the open 

 corolla; calyx lobes ciliate with glandular bristles; corolla blue. 



* * * * Leaves entire, or the lower 1-2-lobed, not cordate, the veins parallel or converging, as 

 in P. circinata; no glandular pubescence ; calyx with long hairs; seeds more than 4- 



7. P. divaricata, Gr. Diffusely spreading, a span or more in height; leaves ovate 

 or oblong; style 2-cleft at the apex only; corolla violet, about 10 lines in diameter. 



4. EMMENANTHB, Benth. 

 Distinguished from Phacelia by the persistent yellow or cream-colored corolla. 



