ARISTOLOCHIA. CV. ARISTOLOCHIACEjE. 465 



SUBCLASS III. APETALJS. 



Corolla none ; the floral envelops consisting of a single series of 

 organs (calyx) only, or sometimes wholly wanting. 



ORDER CV. ARISTOLOCHIACEjJE. BIRTHWORTS. 



Plants herbaceous or shrubby, the latter often climbing. Wood without concentric layers. 



T.i's. alternate, simple, petiolate, ofren with a stipule opposite the leaf, or exstipulate. 



Fls. perfect, axillary, solitary, brown or of some dull color. 



CaL Tube adherent to the ovary, segments 3, valvate in aestivation. 



Sta. 612. epigynous or adhering to the base of the short and thick styles. 



Ova. 3 6-celled. Stiff, radiate, as many as the cells of the ovary. 



Pr. capsule or berry, 3 6-celled many-seeded. 



Embryo minute, in the ba^e of fleshy albumen. 



Genera 8, species 130, most abundant in the tropical countries of S. America, and thinly diffused through- 

 out the northern hemisphere. 



Properties. Tonics and stimulants. Both the following genera' are successfully employed in medicine. 

 Conspectus of the Genera. 



{ equal. Asarum. I 

 Calyx limb { unequal. Aristolochia. 2 



1. ASARUM. 



Said to be from the Gr. a, not, and <ripcj, to bind ; because not used in garlands. 



Calyx campanulate ; stamens 12, placed upon the ovary; anthers 

 adnate to the middle of the filaments ; style very short ; stigma 6- 

 rayed ; capsule 6-celled, crowned wii)h the calyx. Herbs with creeping 

 rhizomas and 1 2 Ivs. on each branch. Fls. solitary. 



1. A. CANADENSE. Wild Ginger. Asarabacca. 



Lvs. 2, broad-reniform ; col. woolly, deeply 3-cleft, the segments reflected. 

 ?|_ A small, acaulescent plant, growing in rich, shady soil, Can. to Ga. and 

 W. States. The leaves are radical, large, 2 4' by 3 5', with a deep sinus at 

 oase, on long, hairy stalks, and having a soft, velvet-like surface. The flower 

 grows from between the bases of the leaf-stalks, solitary, on a nodding pedun- 

 cle, and is close to the ground, sometimes even buried just beneath the surface. 

 Calyx purplish, of 3, broad, long-pointed divisions abruptly spreading. The 

 12 filaments bear the anthers on their sides just below the extremity. The roo< 

 or rhizoma is aromatic, and has been considered useful in whooping-cough. 

 May July. 



2. A. VIRGINICCM. Michx. Sweet-scented Asarabacca. 



Lvs. solitary, orbicular-ovate, glabrous, coriaceous, cordate, entire, obtuse ; 

 ft. subsessile ; col. short, subcampanulate, glabrous externally. Grows in light 

 soils among rocks, N. J. to Ga. A low, stemless plant, very similar in habit tc 

 the preceding. Each branch of the rhizoma bears a terminal leaf and a flower 

 Leaf 3 4' diam., very smooth, clouded with spost, the petiole 2 or 3 time* 

 longer, lobes at base rounded and nearly closed. Flower many times shorte 

 than the petiole. Calyx segments obtuse, of a dusky purple, greenish outside. Apr. 



2. ARISTOLOCHIA. 



Gr. apisTO$, excellent, Xo^eoj, pertaining to parturition ; alluding to the medicinal properties. 



Calyx ligulate, with an inflated base and an unequal border ; an- 

 thers 6, subsessile upon the style ; stigma 6-cleft ; capsule 6-celled, 

 many-seeded. St. erect or twining. 



1. A. SERPENTARIA. Virginia Snake-root. 



St. erect, flexuous ; Ivs. oblong, cordate, acuminate ; ped. radical ; lip of the 

 col. lanceolate. A curious vegetable of low growth, in hedges and thickets, 

 Penn. to 111. and La. Stem 8 13' high, subsimple, jointed, herbaceous. Leaves 

 2 4' by | 2', rarely larger, petioles 3 9" in length. Flowers few, near the 



