POLYGONACEAE (BUCKWHEAT FAMILY) 



359 



Var. littorale (Link) Koch. Leaves 

 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 b. 



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.) FJG. 710 c. 



Var. angustissi- 

 mum Meisn. 

 Leaves linear, 5-9 

 times as long as 

 broad. Summit 

 of Mt. Monad- 

 nock, N. H., and 

 doubtless elsewhere. (Eu.) FIG. 710 d. 



6. P. ere"ctum L. Stout, erect or ascending, yellowish- 

 green ; leaves elliptical, 1.3-6 cm. 

 lone/, 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. 711. P. erectum. 



7. P. rampsissimum Michx. Flowering branch x %. 

 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 



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 



712. P. ramosissimum 

 Fruiting calyx X 3. 



,f flowering branch x %. auth in p& ^ not M eisn.) Sandy soil, Me. and Mass., 

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



712. Forma ATL^NTICUM Robinson. Sepals 5 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. p - tenue - 

 Neb., and Tex. FIG. 713. 



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

 leaves lanceolate to linear, acute at each end, slightly 

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

 P. Doug- short but slender; 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, with thick bulb-like 

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

 deeply 5-deft ; stamens 8 ; styles 3, limy. 



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

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



Stem-leaf (cut 

 to show plicate 

 nature) x %. 



lasii. 

 Stem-leaf x 



