56 PINK ORDER 



(2) Stems leafy at base only, often inflated 



(a) Stems top-like, inflated, bluish; leaves 



smooth, ovate to round E. inftdtum 



(b) Stems solid; leaves woolly, oblanceo- 



late to spatulate E. campaniildtum 



OXYRIA Hill 1765* MOUNTAIN SORREL 



(Gr. oxys, sour) 



PL 9, fig. 18. 



Sepals 4, united, green ; petals none, stamens 6, ovary 1 -celled, style 

 short, 2-parted, stigmas fringed, persistent on the wings of the fruiting 

 calyx, fruit an ovate, lens-shaped achene ; flowers small, perfect, in terminal 

 panicles ; leaves mostly basal, long-petioled, kidney-shaped, round, or heart- 

 shaped ; perennial. 



Stems 2-15 in. high; leaves 1-4 cm, wide O.digyna 



POLYGONUM Linne 1753 SMARTWEED, KXOTWEED, BINDWEED 



(Gr. polys, many, gonu, knee, from the jointed stems) 



PI. 8, fig. 4; pi. 9, fig. 17. 



Sepals 4-5, united, green, white, pink or purple, petals none, stamens 

 5-0, ovary 1-celled, style 2-3-parted, stigmas globose, fruit a flattened or 3- 

 angled (rarely 4-angled) achene; flowers small in terminal or axillary 

 clusters ; leaves alternate, entire with funnel-form sheaths at the base ; an- 

 nual or perennial, terrestrial or aquatic. 



1. Flowers in a single (rarely 2) terminal spike- 

 like cluster or raceme, white to rose-red 



a. Flowers usually white ; stems from a thick 



often bent rootstock ; at altitudes of 7-14000 

 ft. ; bistorts 



(1) Raceme oblong, 1-5 cm. long, 1-2 cm. 



wide; stems 2-10 dm. high P.bistorta 



(2) Raceme cylindric, 3-10 cm. long, .5-1 cm. 



wide ; stems 1-2 dm. high P. viviparum 



b. Flowers rose-red or pinkish, sometimes white 



to greenish; at altitudes of 3-7000 feet; 

 water or mud plants ; hearts-ease, smartweeds 



(a) Racemes 1-3 cm. long; leaves elliptic- 



oblong, obtuse or acute P. amphibium 



(b) Racemes 3-10 cm. long; leaves lance- 



ovate, long-pointed P. emersum 



