564 



Obdbe 91.— HyDiBOBHTLIiAeB^. 



FIG. 6TS. Hydrophyllum Virginicum, 

 flower : a, corolla cut open, Bhowing the 

 honoy-p'ooves ; 6, ovary and style ; o, __.__ 

 section of seeil. GENERA. 



§ Placentffi central, large, many-seeded. Cymes not scorpoid » Htdeolba. 6 



§ Placentffi parietal (at least In the middle), bearing few (1 to 4, rarely many) seeds, (b) 

 b Lobes of the corolla convolute in lestivation. (c) 

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



c Stamens esaertod. Flowers in forked, scorpoid racemes Htdbopiiyllfm. 1 



c Stamens included. Flowei-s solitary, opposite the leaves Nemophila. 2 



d Flowers solitary. Calyx much enlarged in fruit Ellisia. S 



d Flowers racemed.— Lobes of the corolla entire (seeds 4.) PnACBLiA. i 



— Lobes of the corolla entire (seeds oo) Eutoga. 5 



— ^Lobes of the corolla fringed Cosmahthdb. h 



1. HYDROPHYL'LUM, Tourn. Water-leaf Burr-flower. (Gr. 

 'v3(op, water, (pvXXov, leaf; the leaves in spring are said to hold water.) 

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

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

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

 2-valved, 4-secded, 3 of the seeds mostly abortive ; placentse 2, fleshy, 

 free except at the base and apex. — 2f 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 



I Calyx not appendaged. Filaments much exserted Nos. 2—4 



1 H. appendiculitum Mx. Lvs. stibpalmately 5-lobed, the lower almost pin- 

 natifid, tt(i; lobes dentate, diverging, and with the long petioles, ped. and eal. hir- 

 sute ; Sep. lanee-subulate, the appendages at the base ovate, acute, 4 times 

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

 N. T„ near Rochester, to "Wis. and Ta., in woods. Sts. 12 to 18' high, branched. 

 Fetioles 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. Virgmiouni L. Plant nearly smooth ; lvs. 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. Canad^nse L. Zms. smoothish, palmate, roundish, with 5 — 7 shallow hies, 

 unequally dentate, teeth obtuse-muoronate ; 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 — 1 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. maoroph;^llum Nutt. "Whole plant reversely hispid with white haira ; fos. 

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

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

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



