POLYGON ACE AE (BUCKWHEAT FAMILY) 



359 



& e d 



710. P. avlculare. 

 a. Typical form x %. 

 5. v. llttorale x %. 

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

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



doubtless elsewhere. 

 6. P. erect urn L. 



Var. littoraie (Link) Koch. Leaves 

 thick, often obtuse ; achenes slightly 

 shining, obscurely punctate or punctate- 

 striate. (P. littoraie Link.) A mari- 

 time and littoral form sometimes char- 

 acteristic, but passing to the typical 

 form and separated by no constant 

 character. (Eu.) FIG. 710 6. 



Var. vSgetum 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 Meisn. 

 Leaves linear, 6-9 

 times as long as 

 broad. Summit 

 of Mt. Monad- 

 nock, N. H., and 

 (Eu.) FIG. 710 d. 



Stout, erect or ascending, yellowish- 

 green ; leaves elliptical, 1.3-6 cm. 

 long, usually obtuse ; flowers yel- 

 lowish-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, 

 yellowish-green ; leaves lanceolate (2-5 cm. long), 

 acute ; sepals 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. camporum of 

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

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

 712. Forma ATL^NTICUM Robinson. Sepals 6 or rarely 6, roseate, not drying 

 yellow, nor even yellowish. Frequent on the coast, Me. to R. I. In habit 

 identical with the typical western form. 



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

 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 solitary, nearly 

 sessile, erect ; stamens 8 ; achene included, dull 

 black. Dry soil, s. Me. to S. C., w. to Man., Minn., ? 18 - 

 Neb., and Tex. FIG. 713. 



9. P. Douglasii Greene. Stem angled, erect; 



711. P. erectum. 

 Flowering branch x 



712. P. ramosissimum. 

 Fruiting calyx x 3. 

 Bit of flowering branch x %. 

 Stem-leaf x%. 



P- tenue. 

 Stem-leaf (cut 

 to show plicate 



714. 



liisii. 

 Stem-leaf X %. 



leaves lanceolate to linear, acute at each end, slightly nature ) 5 

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

 P. Doug- gjjort but slender; flowers soon deflexeil. 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, with thick bulb-like 

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

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



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

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



