ORDER 93.~HYDROPHYLLACE^E. '253 



salver-form, limb 5-lobecl, orifice open, with or without appen lagos, an tit 

 included. Stig. obtuse, bifid. Ach. bony, rugous or smooth, flat at base. 

 Herbaceous or suffruticous, generally with a thick, reddish root. Flow- 

 ers spiked or racemed, bracted, white or yellow. (See Addenda.) 



* Achenia rngous-tubercled. Corolla throat open, not appendaged, white No. 1 



Achenia smooth and white. Corolla throat appendaged. a Fl*. white.. .No?. 2 1 



a Fls. yellow .Nos. 5--~i 



1 L. arvense L. Wheat-thief. Leaves linear-lanceolate, obtuse, hairy ; calyx nearly 



equal to the corolla, with spreading segments. <JL) A rough weed in fields. lf--18'. 

 Koot reddish. Fls. small, solitary in the upper axils. May, June. Europe. 



2 It. officlnale L. Erect, very branching above ; Ivs. lanceolate, acute, veiny ; calyx 



nearly equal to the tube of the corolla. U Dry soils, N. and M. 1 2f. Flowers 

 small, pedicellate, in recurved, leafy racemes. July. Europe. 



3 It. latlfollum MX. Rough, erect, subsimple ; leaves ovate, sessile, pointed b->tli 



ways ; racemes leafy, sepals lance-linear. 11 Thickets, N. Y. to Va., and W. 2f. 



4 It. angustiiolium MX. Ascending, much branched; leaves linear, rigid ; flowers 



scattered ; corolla hardly exserted. ii Sandy banks, W. 6 15'. Leaves 1'. 



5 L. canescens Lehm. Puccoon. Erect, eubsimple, soft-vi lions; leaves 'oblong or 



linear-oblong, obtuse; stem revolute at top, with the showy orange-yellow flowers 

 axiKary. v. Fields, prairies, N. Y., W. and S. 812'. June, July. 



6 Li. liirtum Lehm. Erect, simple, rough-haired; Ivs. lance-linear, the floral lance- 



ovate ; corolla twice longer than the linear sepals, y. Pa., W. and S. 8 15'. May. 



7 It. lonjflfloruni Spr. Slender, simple, cinereous-strigous ; leaves linear ; corolla 



tube 4 times longer than the calyx (912"). Plains, W. 1015'. July. 



15. MERTENSIA, Roth. SMOOTH LUNGWORT. Calyx short, 5-cleft. 

 Cor. tube cylindric, liinb subcampanulate, 5-cleft, throat open, often with 5 

 folds or ridges between the insertion of the stamens. Sta. inserted at top 

 of the tube. Ach. smooth or reticulated. U St. and Ivs. usually glabrous, 

 pellucid-punctate, the radical many-veined, cauline sessile. Rac. terminal. 



1 M. Vlrginica DC. Ascending, very smooth ; root leaves large, obovate to ovate, 



stem leaves sessile, lance-oblong, all entire, obtuse ; fls. somewhat trumpet-shaped 

 pendent, 10", blue to lilac, very handsome. Rich soils, N. Y., 8. & W. 1 l^f. May. 1 



2 M. maritima Don. Glabrous, weak ; Ivs. ovate, obtuse, fleshy, glaucous ; corolla 



twice longer than calyx, blue-purple. Sea-shore, N. H., and N. : rare. 



3 JH. paulculata Don. Scabrous, erect; Ivs. acuminate, cordate-ovate to oblongr 1 



corolla thrice longer than calyx, blue to white. Lake Superior, and N. t 



ORDER XCIII. HYDROPHYLLACE^E. HYDROPHYLLS. 



Herbs mostly, with alternate-lobed leaves and regular bluish flowers. 

 Calyx 5-cleft, usually with appendages at the clefts, persistent, free. Co- 

 roUa 5-lobed, often with 10 honey scales or furrows near the base. Stametu 

 5, inserted into the corolla, with a deeply bifid style. Ocary entire, ovoid, 

 free, 1-celled, with 2 parietal, several-seeded placentae. Fruit 2-valved, 

 filled by the placentae. Seeds reticulated, albuminous. 



S HYDROPHYLLE.fi. Ovary and pod 1-celled. Style bifid. Leaves cleft. . .(a) 

 i HYDROLEJB. Ovary and pod 2-celled, oo -seeded. Styles 2. Leaves entire... () 



a Lobes of the corolla convolute in the bud... (6) 



a Lob*n of the corolla imbricate (quincuncial) in the bnd...(c> 



