562 OEDBR 90. BORRAGINACEJS. 



10. MERTENSIA, Roth. (Pulmonaria, Tourn.) SMOOTH LUNG- 

 WORT. (Named for Prof. F. C. Mertens, of Bremen, Germany.) Calyx 

 short, 5-cleft; cor. tube cylindric, twice longer than the calyx, limb 

 subcampanulate, 5-cleft, throat naked, or oftener with 5 folds or ridges 

 between the insertion of the stamens ; sta. inserted at top of the tube ; 

 anth. subsagittate ; ach. smooth or reticulated. 2 St. and leaves usu- 

 ally glabrous and pellucid-punctate, the radical many-veined, cauline 

 sessile. Rac. terminal. 



1 M. Virgfnica DC. Erect or ascending, very smooth ; radical Ivs. large, petio- 

 late, oval, ovate or obovate, cauline sessile, lance-ovate or oblong, all entire, ob- 

 tuse ; cor. tube 3 times longer than the calyx, twice longer than the limb. Dry, 

 rich soils, N. Y. to S. Car. and Iowa. A plant of rare beauty, 12 to 18' high. 

 Lvs. 2 to 6' long, the cauline feather-veined. Fls. numerous, nodding, somewhat 

 trumpet-shaped, 10" long, varying through every shade of blue and lilac even on 

 the same plant. May. (Lithospermum pulchrum Lehni.) 



2 M. maritima Don. Glabrous, procumbent or ascending; Ivs. ovate, obtuse, 

 fleshy, glaucous, the radical petiolate, cauline sessile ; rac. leafy ; ca]. deeply cleft, 

 scarcely half as long as the glabrous, 5-cleft corolla. Sea shore, N. Eng., rare, 

 Can. and northward. St. diffusely branched. Fls. purplish blue, limb longer 

 than the tube, which exhibits 5 folds at its summit. Jl. 



3 M. paniculata Don. Scabrous with minute hairs, erect; radical Ivs. petio- 

 late, ovate, cordate, cauline ovate-oblong, sessile, all acuminate and veined ; caL 

 hispid, thrice shorter than the subcampanulate corolla. Shores of the great 

 Lakes, from Superior to Bear L., also in gardens. An elegant plant, with fls. 

 varying from bright blue to white, paniculate, nodding. 



11. MYOSCTTIS, Dill. FORGET-ME-NOT. (Gr. /z^, a mouse, and 

 (ovc;) &Tog, an ear ; from the form of the leaves.) Calyx 5-cleft; cor- 

 olla salver-form or funnel-form, tube about equaling the calyx, the 5 

 lobes convolute in bud, orifice closed with short, concave scales ; ache- 

 nia ovate, smooth, with a small cavity at base. Herbs, slightly villous. 

 Rac. at length elongated, bractless, or with a few, small Ivs. at the base. 

 Fls. never axillary. 



Rncemes one-sided. Calyx clothed with minute, appressed hairs, if any No. 1 



Racemes two-sided. Calyx beset with spreading, minutely-hooked bristles Nos. 2, 3 



1 M. palustris Roth. p. LAXA (Fig. 220). Minutely strigous or smoothish, 

 somewhat branched, erect; Ivs. linear-oblong, obtuse, with short, scattered hairs; 

 rac. without bracts ; pedicels divaricate in fruit, twice as long as the short, spread- 

 ing, smoothish, equal calyx. ^ Ditches and marshes, Can. and TJ. S., very slen- 

 der, about a foot high. Lvs. scattered, sessile, about 1' by 2 or 3". Rac. termi- 

 nal, or often one of them supra-axillary, one-sided. Fls. 2 to 3'' broad, blue, with 

 a yellow center. Ped. 3 to 6" long. May Aug. (M. casspitosa Schultz.) 



2 M. arvensis L. Hirsute with tubercular hairs, branching ; Ivs. oblong-lanceo- 

 late, acute ; pedicels spreading in fruit, twice as long as the open, equal calyx, in 

 loose racemes, which are not at all leafy among the flowers at their base. 

 Fields, &c. Sts. 6 to 15' high. Lvs. 1' and less in length. Fls. 2 to 3'' broad, 

 white? Jl., Aug. "We describe from English specimens, having seen none 

 native. (M. intermedia, Link.) 



3 M. stricta Link. Roughly hirsute with spreading, mostly tubercled hairs; 

 Ivs. oblong, or the lower spatulate-oblong, obtuse or acute, pedicels ascending, as 

 long as the closed, uncinate-bristly, unequal calyx, in racemes which are leafy at 

 base. (g) Dry fields and hills, Conn., N. Y., to Wis., La. and Ala. Plant varying 

 greatly in aspect at different stages of growth, yet always recognized by its calyx, 

 which is decidedly bilabiate, the lower lip of 2 longer teeth. Plant 6 to 16' high, 

 grayish. Lvs. 1' long, or in larger specimens 2'. Fls. very small (1" broad), 

 white. May Jl. (M. verna Nutt. M. arvensis Torr.) 



