254 HYDROPHYLLACE.E. (WATERLEAF FAMILY.) 



Order 52. HYDROPHYLLACE^E. (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) placentae, or rarely 2- celled : style 2-cleft or 2 sepa- 

 rate styles: fruit a 2-valved, 4 to inany-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 apex. 

 h- Ovary lined with the dilated and fleshy 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 Filaments bearded at the middle. 

 2 Kllisia. Stamens shorter than the corolla. Lower and sometimes all the leaves oppo- 

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

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

 +- 4- Ovary with narrow parietal placentae, in fruit projecting inward more or less. 



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



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

 alternate. 

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



glabrous. 



4. Naraa. 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 the ovary, but separate in 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 sinuses, leaves pinnatifid or pinnate, 

 and the peduncle elongated, surpassing the petiole. 



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

 or two high : leaves elongated-oblong in out! are, pi nnately parted or divided into 

 7 to 15 divisions; 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. Fendleri, Gray. Pubescence mainly hirsute or hispid: divisions of 

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

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

 to Colorado. 



2. H. Virgillicum, L. Stem (1 or 2 feet high) and bright green leaves 

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

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



