254 HYDROPHYLLACE^. (WATEKLEAF FAMILY.) 



Order 52. HYDROPHYLLACEJE. (Waterleaf Family.) 



Herbs, commouly hairy, with mostly alternate leaves, regular 5-merous 

 and 5-androus flowers: the ovary entire and 1 -celled with 2 parietal 

 (4 to many-ovuled) placentas, or rarely 2-celled : style 2-cleft or 2 sepa- 

 rate styles : fruit a 2-valved, 4 to many-seeded pod. Flowers chiefly 

 blue or white, in one-sided cymes or racemes. 



* style more or less 2-cleft : ovary 1-celled . and mostly hispid, at least at the ajiex. 

 -I- Ovary lined with the dilated and flesliy placentae. 



1. Hydrophyllum. Stamens and style mostly conspicuously exserted. Leaves alter- 



nate. Calyx with or without a small appendage at each sinus. Corolla campanulate ; 

 the tube within bearing a linear longitudinal appendage opposite each lobe, with in- 

 folded edges, forming a nectariferous groove Fihiuients bearded at the middle. 



2. £llisia. Stamens shorter than the corolla. Lower and sometimes all the leaves oj-po- 



site. Calyx destitute of appendages at the sinuses, usually much enlarged under the 

 fruit. Corolla campanulate , the internal appendages minute or obsolete. 

 -.- H- Ovary with narrow parietal placentEe, in fruit projecting inward more or less. 



3. Phacelia. Calyx naked at the sinuses, deeply 5-parted. Stamens equally inserted low 



down on the corolla. Inflorescence scoipioid. Leaves all, or all but the lowest, 

 alternate. 

 * * Styles 2. distinct to the base: ovary more or less comx)letely 2-celled, and in ours nearly 



glabrous. 



4. Naiua. Corolla funnelform or somewhat salverform. Filaments and styles more or 



less included ; the former commonly unequal and often unequally inserted. Ovules 

 and seeds numerous, on transverse lamelliform placentae, which approximate or cohere 

 in the axis of tiie ovary, but separate lu the loculicidal dehiscence. Low herbs, with 

 (in ours) entire leaves. 



1. HYDROPHYLLUM, Tourn. Waterleaf. 



Herbs with petioled ample and lobed or divided alternate leaves, and 

 cymose clusters of violet-blue or white flowers. Our species have fleshy hori- 

 zontal rootstocks, the calyx naked at the siuuses, leaves piunatifid or pinnate, 

 and the peduncle elongated, surpassing tlie petiole. 



1. H. OCCidentale, Gray. Pubescent, hirsute, or sparingly hispid, a foot 

 or tAvo high : leaves elongated-oblong in outline, pin)iatelij parted or divided into 

 7 to 15 div'isions ; divisions oblong, 1 or 2 inches long, mostly incised or few- 

 cleft, obtuse : cymes mostly dense or capitate : calyx deeply parted, its divis- 

 ions lanceolate : corolla violet-purple, varying to white, ^ inch long. — Proc. 

 Am. Acad. x. 314. 



Var. Feudleri, Gray. Pubescence mainly hirsute or hispid: divisions oj 

 the leaves inclined to ovate-lanceolate, acute or acuminate, inciseli/ serrate : cyme 

 rather open : corolla white or nearly so. — Shady ravines, from New Mexico 

 to Colorado. 



2. H. Virginicum, L. Stem (l or 2 feet high) and bright green leaves 

 almost glabrous, or witb short scattered hairs : leaves ovate in general outline, 

 3 to 5-parted or divided ; divisions (2 to 4 inches long) ovate-lanceolate or 



