130 PEXTAXDUIA MONOGYN1A 



UM>. Sterih, rocky hills; Serpentine ridge, abundaut. ft. April-May, /•>. j u!v 

 Oka. This species seems to be very much c >nflned to tho Serpentine rock, with 

 us. It is very abundant there j and when in full bloom, the hills, at a distance 

 appear as if covered with a sheet of flame. There arc about a dozenother specks 

 enumerated in the U. Stateaj— eome of which are oAen to be met with iu the flower 

 gardens. 



101. CONVOLVULUS. L. Jfutt. Gen. 100. 

 [Latin, CohvoIvo, to entwine, or wind about ; doscriptivo of the plant.] 



Calyx 5-parted, or 6-sepalled, naked, or with 2 bracts at base. CV 

 rolla campanulate, obsoletely 5-lobed, plicate. Stamens shorter thau 

 the corolla. Stigmas lobed, or capitate. Capsule 2 to 3-celled, 2 te 

 3-valved; cells 1 to 2-seeded. 



Uerbn eons : root lactescent ; stem mostly volubile or twining ; leaves alternate 

 peduncles axillary. Nat* Ord* 19& Lindl. Convolvulace.e. 



1. C. BPITHAMiBUS, 7>. Hoary-pubescent ; stein somewhat erect- 

 leaves obovate-oblong, obtuse or acute, subcordate at base; peduncles 

 1 -flowered ; bracts close to the flower, much larger than the calyx 

 Heck, Bot. p. 249. 



C. stuns. Mx. Jim. 1. p. 13G. Per*. Syn. 1. p. 180. Bart. Phil. 1. p. 



158. Bigel. Boat. p. 79. Also, MuhL Catal.p. 23. JSTutU (Jen. 1. p 



123. 



Calystcgia spithamea. Pursh, *9m. I. p. 143. Lindl. Ency. p. 140, 



AlsOy C. tomentosa. Pursh, I. e. 



Spax-lono Convolvulus. 



Root perennial. 1 S/ew 8 to 1*2 inches Ion?, erect or oblique, sometimes nearly 

 procumbent, the procumbent specimens often with assnrgeni branches. Leaves-: 

 t j 3 inches long, and 1 to 2 inches wide , often rounded at apex, sometimes acute ou 

 petioles one fourth to three fourths of an inch long. Peduncles 2 to 4 inches lent; 

 bracts cordate-ovate, enclosing the calyx. Calyx deeply 5-parted, or rather of 5 

 iance-oval membranaceous sepsis, about two thirds the length of the bracts. Co- 

 rolla white, about an inch and half Long. Stigmas oblong. 



Ilab. Dry, hilly woodlands: frequent. Fl. June. FY. Aug. 



Obs. This species is very irregular in its appearance;— being quite abundant iji 

 some seasons, —and then almost entirely disappearing for several years; which 

 leads me to suspect that the root is not perennial— though I have not had ocoaj 

 to ascertain the fact. We have a pretty distinct Variety, which I presume to be 

 theC. stans, of Mx. and others. The stem is usually simple, and (mite ereti 

 feaees elliptic-lanceolate, acute, or acuminate, rather obtuse and unequal attest 

 subsessile, or with a petiole one eighth to one fourth of an inch long; psdmdm 

 usually 2, erect, in the axils of the two lower leaves;— whereas in the leaning, or 

 procumbent variety, there are frequently several ascending brandies, the leaus 

 are generally obovate oblong, and oft on very obtuse, somewhat cordate at base. 

 on petioles half an inch of more in length, with the peduncles from the aiiletf 

 the superior leaves,— or at least half way towards tho summit. 1 think, however, 

 h is scarcely more than a variety. 



2. C. Sepiux, L. Stem twining ; leaves acute, paginate, with the 

 lobes truncate ; peduncles 4-anglcd, 1 -flowered ; bracts close to theflotv- 

 r% cordate, larger than the calyx. Beck t Bot. p. 219. 





