^OLYGOKACEAfi (BCrcKWflEAT FAMILY) 356 



Var. hastkta (Nutt.) Duchartre. Leaves narrow, lanceolate or linear' 

 oblong, sagittate or auriculate-hastate. (-4. hastata Nutt. ; A. Nashii Kearney.) 

 — S. C. to ria. and La. ; said to reach our southern lunit in Va. 



* * Calyx-tuhe strongly curved like a Dutch pipe, contracted at the mouth, the 



short limb obscurely 'S-lobed ; very tall twining shrubs. 



2. A. macrophylla Lam. (Pipe Vine, Dutchman's Pipe.) Nearly gla- 

 brous; leaves round-kidney-shaped (sometimes 4 dm. broad); peduncles with a 

 clasping biaot ; calyx (3 cm. long) with a brown-purple abrupt flat border. {A. 

 6'ipho L'Hfc) — Rich woods, Pa. to Ga., w. to Minn, and Kan. May. 



3. A. tomentbsa Sims. Downy or soft-hairy; leaves round-heart-shaped, 

 very veiny (8-16 cm. long) ; calyx yellowish with an oblique dark purple closed 

 orifice and a rugose reflexed limb. — Rich woods, N. C. to Fla., w. to s. lU. and 

 Mo. June. 



* * * Calyx-tube straight, open, with ample 6-lobed limb, the lobes appendaged; 



anthers equidistant ; erect herbs ; flowers in axillary cymose fascicles. 



i. A. CLEMATiiis L., with long-petioled cordate leaves, sometimes cultivated, 

 has become locally established in the Atlantic States from N. Y. to Md. (Introd. 

 from Eu.) 



POLYGONACEAE (Buckwheat Family) 



Herbs, with alternate entire leaves, and stipules in the form, of sheaths (ocreae, 

 these sometimes obsolete) above the swollen joints of the stem; the flowers mostly 

 perfect, with a more or less persistent calyx, a X-ctiled ovary bearing 2 or 3 styles 

 or stigmas, and a single erect orthotropous seed. Eruit usually an achene, com- 

 pressed or 3-4-angIed or -winged. Stamens 4-12, inserted on the base of the 

 3-6-cleft calyx. 



* Flowers involucrate ; stamens 9 ; stipules none. 



1. Eriogonum. Involucre several-flowered, with flowers exserted. Calyx 6-clefL 



* * Flowers without Involucre ; stamens 4 to 8. 



■*- Stipular sheaths manifest ; ovule erect from the base of the cell. 



•H- Sepals 4 or 6, the outer row reflexed, the inner erect and enlarging In fruit. 



2. Ozyria. Sepals 4, Stigmas 2. Achene orbicular-winged. Leaves reniform. 

 8. Ritmez. Sepals 6. Stigmas 3. Achene 3-angled. 



■H- ++ Sepals 5 (sometimes 4), equal and erect in fruit ; achene triangular or lenticular. 



4. Polygonum. Embryo slender, curved around one aide of the albumen. Achenes inclosed b^ 



the somewhat enlarged fruiting calyx (or exserted in a few species with lanceolate or 

 linear leaves). 



5. Fagopyrum, Embryo in the albumen, its very broad cotyledons twisted-plaited. Fruit much 



exserted from the scarcely enlarged calyx. Leaves deltoid, sagittate or hastate. 



6. Polygonella. Embryo slender, nearly straight. Pedicels solitary. Leaves linear. Plant 



heath-like. 



■f- -t- Stipules obsolete ; ovule hanging irom the apex of a slender stalk. 



7. Brunnichia. Calyx 5-parted, in fi*uit with a wing decurrent on the pedicel. Tendril-climber 



1. ERi6G0NUM Miohx. 



Mowers perfect, involucrate ; involucre 4-8-toothed or -lobed, usually many- 

 flowered ; the more or less exserted pedicels intermixed with narrow scarious 

 bracts. Calyx 6-parted or -cleft, colored, persistent about the achene. Stamens 

 9, upon the base of tlie calyx. Styles 3 ; stigmas capitate. Achene triangular. 

 Embryo straight and axial, with foliaceous cotyledons. — Leaves entire, without 

 stipules. (Name from epiov, wool, and 76;'u, knee.) 



1. E. longifblium Nutt. Perennial, erect ; leaves oblanceolate, acute oi 

 acutish, canescent beneath, the lower cuneate at base; sepals linear, caudate- 



SBAir'S MANCJAt — 23 



