154 HYDR0PHYLLACE.1:. H/jdropJiijUum. 



irregular, leaving the thin dissej^iment with the central placenta. Styles 2. Corolla 

 nearly rotate, imbricated in the bud. Seeds very numerous, with fleshy albumen. 

 Leaves all alternate, simple and entire. ' 



14. HYDROLEA. The only genus. 



1. HYDROPH^LLUM, Tourn. Waterleaf. (Formed of vdcoQ, 

 water, and qivD.ov, leaf, a name of no obvious application.) — North- American 

 herbs ; with j^etioled ample and lobed or divided alternate leaves, and cjmose 

 clusters of violet-blue or white flowers, in early summer. 



§ 1. Htdrophyllum proper. Perennial, with fleshy horizontal rootstocks : 



calyx naked at the sinuses, except occasionally in the last species. 



* Leaves pinnatitiJ or pinnate : at least the calyx and inflorescence hispid. 



•)— Peduncles shorter than the petioles, generally shorter than the mostly dense inflorescence: 

 antliers short-oblong. 



H. macrophyllum, Nutt. Hispid or rough-hirsute, stout, 2 or .3 feet liigh : lower 

 leaves commonly a foot long ; the divisions oval or ohlong, obtuse, 2 or 3 inches long, in- 

 cisely toothed ; the upper ones confluent : stout peduncles commonly forked : cymes very 

 dense : calyx white-hispid, not deeply parted ; its divisions triangular-subulate, tapering 

 gradually from the broad base, loosely spreading: corolla dull white, half an inch long. ^ 

 Jour. Acad. Philad. vii. 111. — Rich woods, Ohio to Virginia and Alabama, and west to 

 the Mississippi. 



H. capitatum, Dougl. Only a span or so in height, tufted : copious fascicled roots 

 fleshy and almost as large as tlie short rootstocks : leaves longer than the stem, and with 

 blade mostly shorter than the petiole, ovate or roundish in general outline, 2 or 3 inches 

 long, softly hirsute or pubescent, pinnately 5-7-parted or at base divided ; the divisions 

 2-.3-lobed or cleft ; the lobes oblong, obtuse and mucronate : flowers capitate-cj'niose : 

 calyx very hispid. — Benth. in Linn. Trans, xvii. 273 (excl. Calif, pi. &c.) ; A.DC. Prodr. 

 ix. 280; Hook. Kew Jour. Bot. iii. 292 (var. pinnihim) ; Watson, Bot. Iving, 219. — Hillsides, 

 &c., Washington Terr, to the Sierra Nevada, California, and Utah. 



Var. alpinum, Watson, 1. c. Nearly acaulescent in dense tufts : flowers distinctly 

 pedicellate in a somewhat open cyme close to the ground : caly.x densely white-hairy, but 

 less hispid. — Eastern California and Nevada, in the liigher Sierra Nevada and Humboldt 

 Mountains. 



•J— -t— Peduncle elongated, surpassing the petiole and often surpassing the subtending leaf: anthers 

 oblong-linear. 



•M- Cauline leaves elongated-oblong in general outline, pinnately parted or divided into 7 to 15 

 divisions. 



H. occidentale, Gray. Pubescent, hirsute, or sparingly hispid, a foot or two high : 

 divisions of tlie leaves oblong, an inch or two long, mostly incised or few-cleft, obtuse : 

 peduncles rather slender : cymes mostly dense or capitate : cal^^x deeply parted, its divi- 

 sions lanceolate and rather obtuse, more erect : corolla violet-purple, varying to white, a 

 third inch long. — Proc. Am. Acad. x. 314, & Bot. Calif. 1. c. //. capitatum, Torr. Pacif. R. 

 Rep. iv. 125, not Dougl. — Oregon {yiittal!) and N. & W. California. 



Var. "Watsoni, Gray, 1. c, Commonly low, sometimes almost stemless, soft-pubes- 

 cent, especially the lower side of the leaves (which is sometimes canescent), as also the 

 sparsely hispid calyx : cyme sometimes open. — //. mnrrophijUum, var. occidentale, Watson, 

 Bot. King, 248, mainly. — Sierra Nevada, California, to Utah, Anderson, Bohtnder, Watson, &c. 

 Var. Fendleri, Gray, I.e. Pubescence mainly hirsute or hi.spid, not at all canescent 

 or cinereous : divisions of the leaves inclined to ovate-lanceolate, acute or acuminate, in- 

 cisely serrate : peduncle shorter: cyme rather open: corolla white or nearly so. — Shady 

 ravines, Santa Fe', New Mexico, to Colorado, Fendler, Greene, T. M. Cordter, &c. 

 ++ ++ Cauline leaves ovate in general outline, 3-5-parted or divided. 



H. Virginicura, L. Stem (a foot or two high) and bright green leaves almost glabrous, 

 or with sliort scattered hairs : divisions of the leaves (2 to 4 inches long) ovate-lanceolate 

 or rhomboid-ovate, acuminate or acute, coarsely incised-toothed ; the lowest commonly 

 2-clef t and the terminal one often 3-lobed : peduncle usually once or twice forked : cyme 



