ORDER 93. HYDROPHYLLACE^E. 253 



salver-form, limb 5-lobed, orifice open, with or without appendages, a nth. 

 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 rugous-tubercled. Corolla throat open, not appendaged, white No. 1 



Achenia smooth and white. Corolla throat appendaged. a Fls. white. . .Nos. 2 1 



a Fls. yellow. .Nos. 57 



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



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

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



2 I*, officinale 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. 



I^. latifolium MX. Rough, erect, subsimple ; leaves ovate, sessile, pointed both 

 ways ; racemes leafy, sepals lance-linear. 7f Thickets, N. Y. to Va., and W. 2f. 



4 Li. angnstiiolium MX. Ascending, much branched ; leaves linear, rigid ; flowera 



scattered ; corolla hardly exserted. V Sandy banks, W. 615'. Leaves 1'. 



5 L. canescens Lehm. Puccoon. Erect, subsimple, soft-villous ; leaves oblong or 



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

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



6 Ij. 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. 815'. May. 



7 Li. loiiiiitloruiu Spr. Slender, simple, cinereous-strigous ; leaves linear ; corolla 



tube 4 times longer than the calyx (9 12"). Plains, W. 1015'. July. 



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

 Cor. tube cylinclric, limb 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, y St. and Ivs. usually glabrous, 

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



1 HI. Virgiiiica. 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., S. & W. 1 Iff. May. 1 



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



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



3 JW. paiiiculata Don. Scabrous, erect ; Ivs. acuminate, cordate-ovate to oblong 



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



ORDER XCIII. HYDROPIIYLLACE^E. HYDROPHYLLS. 



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

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

 rolla 5-lobed, often with 10 honey scales or farrows near the base. Stamen* 

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

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

 filled by the placenta?. Seeds reticulated, albuminous. 



HYDROPHYLLEjfl. Ovary and pod 1-celled. Style bifid. Leaves cleft. . .(a) 

 $ HYDROLEvE. Ovary and pod 2-celled, CO -seeded. Styles 2. Leaves entire. ..(|) 



a Lobes of the corolla convolute in the bud...(/<) 



a Loben of the corolla imbricate (quiucuucial) in the bad. ..(c) 



