Mertensia. XCIV. BURR AGIN ACEiE. 433 



cence ; /.'^. scattered, lateral, axillary; ach. turs^id, ovoid, shining, impressed- 

 punctale. — Banks ol .stre.iins, sandy prairies, Oliio river, Mickaux, 111. Mead. 7 

 An obscure species, wholly unknown to me. 



4. L. ARVENSK. Corn GruinircU. Whcat^thicf. 



Lis. linear-lanceolate, obtuse, hairy; cal. iiearly ecjual to the corolla, 

 with spreading segments; ac/i. rugose. — (i) A rough, pilo.se weed, introduced 

 into our fields and waste* grounds, much to the annoyance of the farmers. The 

 stem is branching, erect, 12 — 15' high, iVoni a lusilurm loot with reddish bark. 

 Leaves Itrighl green, rough, sessile, 1 — -J' in length, with only the central v*.'in ; 

 the lower ones obtuse and narrowed to the base ; upper ones subacute. Flowers 

 small, white, subsessile, solitary, in the axils of the upper leaves. May, Jn. 

 ♦ * Mowers i/ellow. 



5. L. CANEscENs. Lchmann. (Batschia canescens. Michx.) Pucr^rm. 

 St. erect, subsimple, solily villose ; Irs. oblong, obtuse, silky-canescent 



above, villous beneath ; Jls. axillary ; tube of the corolla thrice as long as the 

 very short calyx. — % A handsome "plant, with bright yellow flow^ers, found in 

 prairies, fields and dry hills, Can., N. Y. ! to ill. ! and Southern States. Stem 

 8 — 12' high, erect, simjile, rarely a little branched above, hoary-villose. Leaves 

 sessile, 2 — 3" wide and 4 times a.s long, 1-veined. Flowers crowded near the 

 summit of the stem. Calyx segments lanceolate, acute. Corolla bright 

 orange-yellow, including the subsessile stamens and short style, Jn., Jl. The 

 root IS used to dye red by the Indians. 



G. L. iiiRTUM. Lehm, (Anchusa, Muhl. Batschia Carolinensis. Gmel.) 

 Herbaceous, erect, simple, hairy above ; Ivs. sessile, linear-lanceolate, 

 obtuse, ciliate-hirsute both sides, tloral ovate-lanceolate; cal. lobes linear, hir- 

 sute, a little shorter than the tube of the corolla ; cor. segments .spreading, 

 obovate, entire, tube hispid inside at ba.se ; ac/i. ovoid, shining. — % Can., Penn., 

 to La. Stems 8 — 12' high, clustered. Flowers crowded, racemed. Corolla 

 orange-yellow, large. 



7. L, Apulum. Vahl. (Myosotis. Li7in. M. lutea. Lam.) 

 St. herbaceous, erect, rough with hairs; lis. linear-lanceolate, acute, 

 erect, rough and hairy; s/j/Its hispid ; bra^/s foliaceous; cor. longer than the 

 calyx; «<:/t. muricate,— Dry woods, Ohio. Pursk. Stem 2 — 6' high, gene- 

 rally simple at base, branched above. Corollas small, yellow, in the axils of 

 lanceolate bracts, 



8, PENTALOPHUS. Alph, DC, 

 Gr. TTCvTe, fine, \o(bog, crest; from the character. 



Calyx 5-parted, with linear segments ; cor. hypocrateriform, tube 

 eylindric. much longer than the calyx, throat closed with 5 glabrous 

 valves alternating with the stamens, segments ovate, spreading, much 

 shorter than the lube ; achenia solitary by abortion, ovoid, white, 

 smooth. — American herbs. 



P, LONGiFLORUs. Alph. DC. (Lithcspcrmum. Spreng. Bat.schia. Nutt.) 

 Erect, strigo.se with a cinerous pubescence ; hncer Ivs. lance-linear, attenu- 

 ated to the ba.se, obtuse, iippcr one.^ linear, acutish ; rac. leafy, terminal ; cal. 

 seg. linear, much longer than the pedicel ; cor. tube 4 times longer than the calyx, 

 a^little dilated upwards. — l^ Prairie du chien to Mo. ! Stem 10—15' high, 

 slender, branched near the top. Leaves 1 -U' by 2 — 3", the floral ones about as 

 long as the flowers. Corolla yellow, the tube 8—10" long, lobes crenulate. 

 Style scarcely exserted. Fruit much shorter than the calyx, smooth, white, Jl. 



9. MERTENSIA. Roth. 



Calyx short, 5-cleft; cor. tube eylindric, twice longer than the 



calyx, limb sul3campanulate, 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. — 



