Cerastium. CARYOPHYLLACE^. 99 



2. Cerastium viscosum, Linn. Viscous Mouse-ear Chickweed. 

 Hairy and rather viscid ; stem spreading ; leaves lanceolate-oblong, obtusish ; cymes rather 



loosely flowered, with the pedicels mostly longer than the calyx ; capsule nearly twice as long 

 as Ihe calyx. — Eng. bot. t. 790 ; Torr.Jl. I. p. 4:58 ; Bigel.fl.Bost.p.lM; DC.prodr.l. 

 p. 415 ; Darlingt.fl. Cest. p. 278 ; Ton: <^ Gr.fl. N. Am. I. p. 187. C. vulgatum, MuU. 

 cat. (fide Darlingt.). 



Perennial? Stems 6-12 inches long. Leaves an inch or more in length, sessile and 

 rather broad at the base, much shorter than the internodes. Flowers and fruit resembling 

 those of the preceding species. — A larger and coarser plant than C. vulgatum, as well as 

 deeper green and less hairy. 



Fields, road-sides, and cultivated grounds ; very common. Introduced from Europe. Fl. 

 May - September. 



3. Cerastium arvense, Linn, Field Chickweed. 

 Stems declined at the base, retrorsely pubescent ; leaves linear or linear-lanceolate, rather 



acute ; cymes few-flowered, on an elongoted naked peduncle ; petals obovate, more than 

 twice the length of the sepals ; capsule oblong, a little exceeding the calyx. — Eng. hot. 

 t. 93 ; DC. prodr. \.p. 419 ; Hook.fl. Bor.-Am. I. p. 104 ; Torr. ^ Gr.fi. N. Am. I. p. 188. 

 C. Pennsylvanicum, Hornemann ; DC. I. c. ; Hook. I.e. C. tenuifohum, Pursh,fl. l.p.321; 

 Torr. fl. p. 460 ; Darlingt. fl. Cest. p. 278. C. elongatum, Pursh, I. c. ; Nutt. in journ. 

 acad. Phil. 7. p. 16. 



Perennial. Stems cespitose, more or less assurgent or erect, 4-8 inches high. Leaves 

 10 - 15 lines long, and 1 - 2 lines wide, rather acute, and late in the season somewhat rigid, 

 often fascicled in the axils. Flowers rather conspicuous. Sepals ovate-lanceolate, strongly 

 one-nerved. Petals emarginate, or slightly bifid. Capsule sometimes one-third longer than 

 the calyx. Seed reniform, muricate in curved lines. 



Rocky places; rather common. May July. Scarcely distinct from the European 

 C. arvense. 



4. Cerastium oblongifohum, Torr. Oblong-leaved Chickweed. 

 Stems erect or declined, villous ; leaves oblong-lanceolate, mostly obtuse ; flowers numerous; 



peduncles viscid ; petals obovate, 2-clcft, twice the length of the oblong obtuse sepals ; cap- 

 sule cylindrical, about twice as long as the calyx. Torr. in Sill. jour. 4. p. 63, andfi. 1. 

 p. 460 ; Torr. 4- Gr.fl. N. Am. 1. p. 188. C. villosum, " Muhl. cat. p. 46"; Darlingt. fl. 

 Cest. l.p. 279. C. pubesccns, Goldie inEdin. phil. journ.'k.p. 387. C. Pennsylvanicum, 

 Hook.fl. Bor.-Am. l.p. 104? (excl. the syn. of C. tcnuifolium). 



Perennial. Stems 6-12 inches high, rather stout, very villous, tomcntose at and below 

 the nodes. Leaves an inch or more in length (sometimes shorter), ovale and oblong-lanceolate, 



13» 



