APOCYNACE.E. 289 



M. TBIPOLIATA, L. Marsh Trefoil. Buckhcan. 



.leases trifoliate; leujUU obovate ; peduncles long naked; s^cu'j obtuse, % as long 

 as th : corolla; petals a-mtc, about aa long a* the stamens. 



B;"r a , margins of ponds. A fine plant arising from large, black roots, desc^nd- 

 i;iS do-p into the lo:iry earth. Stem 8 to 12 inches high, round. Flowers v. bite 

 or flesh-color, beautifully fringed with soft hairs at the base and in the- tube of 

 the corolla. 



6. OBOLARIA, Linn. Pennywort. . 



Or. obolos, a small coin, with which the leaves of this plant are compcrsd. 



Calyx of 2 spatulatc spreading sepals, resembling the 

 leaves. Corolla tubular-bell-shaped, withering-persistent, 

 4-cleft, the lobes oval-oblong, or sometimes spatulatc. Sta- 

 mens 4, inserted at the sinuses of the corolla, short. Style 

 short persistent : stigma 2-lipped. Capsule ovoid, 1 -cel- 

 led, 2-valved, many-seeded. — A low and very smooth pur- 

 plish-green perenniel with opposite tvcJ^e ohovatc leaves, and whi- 

 tish or purplish terminal and axillary Jhwers solitary or in clusters 

 of 3. 



0. VlRGINlCA, L. Virginian Pennywort. 



Slem simple or with a few opposite branches above; leaves cuncate-obovatc c-r 

 rounJish-rhomboiCal, sessile and decurrent at base. 



Rich wood.-', rare. April. May. Stent i to 8 inches high, oftcn'ia clusters. Ct-r- 

 olut pale-purplish or whitish, longer than the stamens. 



Order 81. APGOYNAGEJE — Dogbane Family. 



Plants tciih mill y acrid juics, entire chiefly orp.o-Me leaves witltout slipides, regit- 

 lar b-mzrous and b-androns flowers, zvith tlie 5 lobes of the corolla convolute end twist- 

 td in the bud. — Calyx entirely free from the 2 ovaries, persist. nt. Filaments dis 

 tiact: jwllen granular, glofcose or 5-lobed. Frcit a pair of foliiclep, rarely one of 

 them abertive. S-£3S numerous, amphitropous. Chiefly tropical plants. 



1. APOOYNUM, Toum. Dogbane. 



•dr. apo, away, and lucn, a dog; to which the plant was thought to bo po:?onons 



Calyx 5 parted, with acute lobes. Corolla bell-shaped, 

 5-clcft, with 5 triangular appendages in the threat opposite 

 the lobes. Stamens 5, inserted on the base of the corolla:: 

 rttnthers arrow-shaped, longer than the filaments : .filaments 

 slightly adherent to the 2-lobed stigma by their inner face. 

 Ftuit of 2 long and slender follicles. — Perennial herls, with 

 opposite entire mucronatt leaves, and small pale flowers in terminal 

 and axillary cymes. 



1. A. androsjemifolium, L. Dog'iliinc. 



Smooth, branched above, the branches diverging; Uatts crate distinctly jetio 



J2 



