ORDER CVIII. EUPHORBIACEJS. 495 



3. A. sekpenta'ria, (L.) Ste?n herbaceous, pubescent, erect, genicu- 

 late and flexuous, geniculate at the base. Leaves cordate, oblong, acu- 

 minate, slightly hairy. Flowers on radical peduncles, sometimes under 

 the surface of the ground. Limb of the perianth lanceolate, ventricose 

 at the base. — ^. Through the summer. Dry soils. 8 — 12 inches. 



Virginia Snake-root. 



4. A. hasta'ta, (Nutt.) Stem flexuous, simple, erect and procumbent. 

 Leaves somewhat cordate, hastate, acute, auriculate. Peduncles radi- 

 cal ; lip of the perianth ovate. — Mountains. 



Order CVII.— EMPETRA'CEJE. (Orowberry Family.) 



Flowers dioecious. Perianth consisting of 2 — 4 rows of im- 

 bricated hypogynous scales. Stamens equal in number to the 

 scales, and alternate with them. Anthers with 2 distinct cells. 

 Ovary superior, seated in a fleshy disk, 6 — 9-celled. Style 1. 

 Stia?na multifid, radiating. Fruit baccate, 2-celled, 2-seeded. 

 An evergreen shrub, with flowers in the axils of the leaves. 



Genus I.— CERATIO'LA. Mich. 20—2. 

 (From the Greek keration, a little horn, from the shape of the stigma.) 



Genus the same as the Order. 



1. C. ericoi'des, (Mich.) An evergreen shrub, withvirgate branches, 

 somewhat verticillate when young, tomentose. Leaves linear, glabrous, 

 rigid, with the margins revolute, verticillate, 3 — 4 in a whorl. Flowers 

 axillary, sessile. Scales of the calyx persistent, tomentose. Berries 

 small, 2-seeded. — ^. Aug. — Sept. Dry soils. 4 — 8 feet. 



Order CVIIL— EUPHORBIA'CE^E. 



Flowers monoecious, or dioecious. Perianth lobed, inferior, 

 frequently with glandular or scaly appendages. Sterile flowers. 

 Stamens 1 — 12, or numerous. Fertile flowers. Ovary 1, su- 

 perior, sessile or stiped, usually 3-celled. Ovules solitary, or 

 twin, suspended. Styles usually 3, sometimes united. Fruit 

 usually consisting of three dehiscent cells, separating from the 

 axis. Seed suspended. Herbaceous or shrubby plants, usually 

 with milky juice. 



ANALYSIS. 



1. Stamens 4 or less 2 



Stamens more than 4 6 



2. Stamens 4 Pac?iysandra, 10 



Stamens less than 4 3 



8. Involucre corolla-like Euphorbia, 1 



Involucre calyx-like 4 



4. F'.owers dioecious Borya, 11 



Flowers monoecious 5 



5. Flowers separate Tragia, 3 



Several in an involucre Stillingia, 2 



