374 POLYGONACEuE. (BUCKWHEAT FAMILY.) 



sessile (greenish-white, sometimes tinged with purple) ; sheaths much shorter 

 than the lower leaves ; stamens 5 or 8 ; fruit enclosed in the calyx, dull, minutely 

 wrinkled-striate or granular under a lens, (l) — Waste places and gravelly banks ; 

 everywhere the commonest weed. (Eu.) 



Var. ei'ectllSBB, Koth. Stems upright or ascending ; leaves broader (ob- 

 long or oval) and larger; stamens commonly 5. (P. erectum, L.) — In richer 

 soil or more shaded places ; common. 



Var. lifXOl'ieHe, Link. Prostrate, very short-jointed ; leaves elliptical-lan- 

 ceolate or narrowly oblong, thickened, glaucous ; the sheaths larger in propor- 

 tion ; fruit longer than the calyx, smooth, (j) (P. maritimum, Bay, &c. P. 

 glaucum, Nutt. P. Robert!, Lois.) — Sandy sea-beach, Rhode Island to Vir- 

 ginia. Probably a mere state of P. aviculare altered by salt water. (Eu.) 



12. P. rctillOSissiiniBlM, Micks. Stems erect or ascending, much 

 branched (2° -4° high), rigid, many-striate ; lutces lanceolate or linear, tapering 

 into a petiole ; sheaths mostly short ; flowers greenish-white (yellowish in drying); 

 stamens commonly G ; fruit smooth and shining, partly protruded from the calyx. 

 (T; — Sandy shores and banks of streams, Michigan to Illinois and southward. 

 Salt marshes, Rhode Island, Olney. Aug. - Oct. — Larger leaves 2' long. 



13. P. tenuc, Michx. (Slender Knotgrass.) Stem slender, upright, 

 sparingly branched (6'- 12' high), sharp-angled ; leaves sessile, narrowly linear, 

 very acute; sheaths capillary fringed; flowers greenish-white ; fnat smooth and 

 shining. (J) — Dry soil, and rocky hills ; rather common. July - Sept. 



* * Flowers solitary from the axils of closely approximated or imbricated truncate 

 bracts, forming many-jointed terminal spikes: sheaths cylindrical, naked, entire. 



14. P. articiiIiUmn, L. (Jointweed.) Stem upright, paniculately 

 branched (4'- 12' high), slender; leaves linear-thread-form, deciduous; flow- 

 ers crowded in slender and spike-like paniclcd racemes, on recurved pedicels 

 twice the length of the joint-like bracts (bright rose-color) ; fruit smooth and 

 shining. — Dry, sandy soil; common along the coast, along all the Great 

 Lakes, and in intermediate places in New York. Aug. — Singular for its many- 

 jointed spikes or racemes, which are l'-3' long; the lower bracts tooth-pointed 

 on one side. — Not a Polygonclla ! 



$5. TOVARIA, Adans. — Calyx rather herbaceous (greenish) , unequally ^-parted : 

 stamens 5 : styles 2, distinct, rigid and persistent on the smooth lenticular achenium 

 (cotyledons oblong, accumbent) : perennial : flowers loosely disposed in a naked long 

 and slender spike. 



15. P. Virgillisanuili, L. Almost smooth ; stem terete, upright 

 (2° - 4° high) ; leaves ovate, or the upper ovate-lanceolate, taper-pointed, round- 

 ed at the base, short-petioled, rough-ciliate (3' -6' long) ; sheaths cylindrical, 

 truncate, hairy and fringed ; flowers 1-3 from each bract, somewhat curved, 

 the styles in fruit obliquely bent down, minutely hooked at the tip. — Thickets 

 in rich soil ; common. Aug. 



§ 6. TINlARIA, Meisn. — Calyx 5-parted (rarely 4-parted) : stamens mostly 8 : 

 styles or capitate stigmas 3, and achenium 3-sided, or, in No. 16, styles 2 and ache- 



