564 ORDER 91. HYDROPHTLLACE^. 



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FIG. 678. Hydrophyllum Virginicum, 

 flower : a, corolla cut open, showing the 

 honey-grooves ; &, ovary and style : c, 

 section of sec.l. GENERA. 



Placentre central, large, many-seeded. Cymes not scorpoid HYDROLKA. 6 



Placentaj parietal (at least in the middle), bearing few (1 to 4, rarely many) seeds, (b) 

 b Lobes of the corolla convolute in aestivation, (c) 

 b Lobes of the corolla imbricate (quincuntial) in the bud. (d) 



C Stamens exserted. Flowers in forked, scorpoid racemes HYDROPIIYLLUM. 1 



C Stamens included. Flowers solitary, opposite the leaves NEMOPHILA. 2 



d Flowers solitary. Calyx much enlarged in fruit ELLISIA. 3 



d Flowers racemed. Lobes of the corolla entire (seeds 4.) PIIACELIA. 4 



Lobes of the corolla entire (seeds oo) EITTOCA. 5 



Lobes of the corolla fringed COSMANTUUS. 6 



1. HYDROPHYL'LUM, Tourn. WATER-LEAF BURR-FLOWER. (Gr. 

 ), water, ^uAAov, leaf; the leaves in spring are said to hold water.) 

 Sepals slightly united at base, the sinuses sometimes appendaged ; cor- 

 olla campanulate, convolute in bud, with 5 longitudinal, margined nec- 

 tariferous grooves inside ; stamens exserted; capsule globous, 1- celled, 

 2-valved, 4-seeded, 3 of the seeds mostly abortive ; placentae 2, fleshy, 

 free except at the base and apex. 2J! Radical Ivs. on long petioles, 

 pinnately or palmately veined, cauline alternate. Cymes scorpoid, 

 bractless. 



Calyx appendaged between the sepals at base. Stamens as long as the corolla No. 1 



Calyx not appendaged. Filaments much exserted Nos. 2 4 



1 H. appendiculatum MX. Lvs. subpalmately 5-lobed, the lower almost pin- 

 natifid, the lobes dentate, diverging, and with the long petioles, ped. and caL hir- 

 sute ; sep. lance-subulate, the appendages at the base ovate, acute, 4 times 

 shorter ; cor. glabrous except the minute appendages inside ; stam. included. 

 N. Y,, near Rochester, to Wis. and Va., in woods. Sts. 12 to 18' high, branched. 

 Petioles 1 to 4' long. Lvs. roundish in outline, the broad, acute lobes pointed 

 and diverging in a stellate manner. Cal. 4 to 5'' long, appendages deflexed, 1" 

 long. Cor. blue. May. 



2 H. Virginicum L. Plant nearly smooth ; Ivs. pinnatifid and pinnate, the seg- 

 ments oval-lanceolate, incisely serrate ; fascicles conglomerate ; ped. longer than 

 the petioles. An inhabitant of moist woods, Can to Car. and Western States. 

 Stem a foot high, bearing large, roundish tufts of flowers, stamens and style very 

 conspicuous, twice the length of the bell-shaped corollas. Leaves few, on long, 

 clasping petioles, with about 5 distinct leaflets, the upper 3 more or less confluent 

 at base, all irregularly toothed. Corollas varying from white to sky-blue. Jn. 



3 H. Canadense L. Lvs. smoothish, palmate, roundish, with 5 7 shallow lobes, 

 unequally. dentate, teeth obtuse-mucronate ; fls. in crowded fascicles; ped. shorter 

 than the forked petioles. Quite different in aspect from the last. Found in alpine 

 woods, Can. to Car. W. to Ind. Stem 12 18' high, with large, roughish leaves, 

 divided into 5 7 lobes. Fascicles of fls. dense, terminal, but shorter than the 

 petiole which seems to continue the stem. Cor. white or variously tinged with 

 purple, much longer than the pedicels. Jn., Jl. 



4 H. macroplTy-lhim Nutt. Whole plant reversely hispid with white hairs; Ivs. 

 oblong-oval, in outline, pinnatifid, lower segments distinct, upper confluent, all incised 

 into rounded, mucronate teeth, cauline solitary or few, much smaller ; cymes ter- 

 minal, long-pedunculate, dense-flowered ; cor. glabrous except the grooves inside. 



