POLYGON ACE AE (BUCKWHEAT FAMILY) 



359 



6 e 



710. P. aviculare. 



a. Typical form x %. 



b. V. littorale x %. 



c. Stem-leaf of v. vegetum x %. 



d. Stem-leaf of V. angust. x%. 



doubtless elsewhere. 

 0. P. erectum L. 



Var. littor^ie (Link) Koch. LeavevS 

 thick, often obtuse ; achenes slightly 

 shining, obscurely punctate or punctate- 

 striate. (P. littorale Link.) — A mari- 

 time and littoral form sometimes char- 

 acteristic, but passing to the typical 

 form and separated by no constant 

 character. (Ku.) Fig. 710 h. 



Var. vegetum Ledeb. Larger, erect 

 or nearly so ; the leaves (often 3 cm. 

 long) oblong or narrowly elliptic, thin, 

 the margins crisped. — Rich soil and in 

 shade. (Eu.) Fig. 710 c. 



Var. angustissi- 

 mum. ]\Ieisn. 

 Leaves linear, 5-9 

 times as long as 

 broad. — Summit 

 of Mt. Monad- 

 nock, N. H., and 

 (Eu.) EiG. 710 d. 



Stout, erect or ascending, yello%A'ish- 

 green ; leaves elliptical^ 1.3-6 cm. 

 long, usually obtuse ; flowers yel- 

 loicish-green, about 3 mm. long, 

 on more or less exserted pedicels; 

 stamens 5-6 ; achene dull, included. 

 — Waysides, waste places, etc. Fig. 

 711. 



7. P. ramosissimum Michx. 

 Erect or ascending, 0.6-1.9 m. high, 

 yello^^^sh-green ; leaves lanceolate (2-5 cm. long), 

 acute; sejials 6, the 3 outer 2-3 mm. long, carinate^ 

 cucullate at the summit, drying green with yellow mar- 

 gins ; the inner sepals smaller, yellow ; stamens 3-6 ; 

 achene smooth, shining, included. (P. campornm of 

 auth. in part, not Meisn.) — Sandy soil, Me. and Mass., 

 local; w. Pa. ; 111. to Minn., Tex., and westw. Fig. 

 . .-. Forma atlAxticum Robinson. Sepals 5 or rarely 6, roseate, not drying 

 yellow, nor even yello^^ish. — Frequent on the coast, Me. to R. L In habit 

 identical ^^ith the typical western form. 1 



8. P. tenue Michx. Stem angled^ erect (1.5-4 dm. high), l 



glabrous, or slightly scabrous at the nodes ; leaves narrowly lan- 

 ceolate to linear, 2-5 cm. long, acute at each end, 

 strongly plicate; flowers usually solitaiy, nearly 

 sessile, erect ;■ stsimens 8; achene included, dull 

 black.— Dry soil, s. Me. to S. C, w. to Man., Minn., ^1=3. P. tenne. 

 Neb., and Tex. Fig. 713. Stem-leaf (cut 



\V 9. P. Douglasii Greene. Stem angled, erect; toshowphcate 



U leaves lanceolate to linear, acute at each end, slightly °" ""''' ^^■ 



' rigid, the margins revolute but the surface not plicate ; pedicels 



short but slendei>; flowers soon deflexed. — Rocky or sterile soil, 

 w. Me. to n. N. Y., Ont., and westw., local; common in Rocky 

 Mts. Fig. 714. 



§2. BISt6rTA [Tourn.] L. Glabrous alpine perennials, loith thick bulh-lil-e 

 caudex and simple stems; floicers in a spike-like raceme; calyx colored, 

 deeply b-cleft ; stamens 8 ; styles 3, long. 



10. P. viviparum L. Smooth, dwarf (4-35 cm. high), bearing a linear erect 

 spike of flesh-colored flowers (or often little red bulblets in their place) : leaves 



711. P. erectum. 

 Flowering branch x %. 



712. P. ramosissimum. 

 Fruiting calyx X 3. 

 Bit of flowering branch x % 

 Stem-leaf x%. 



712 



\l 



714 



p. Doug- 

 lasii. 



Stem-leaf x %. 



