Spring Flora of Oklahoma 
86 
glabrous, rather pale gromi. Stem stout, erect, grooved, 2°-4° tall. 
Leaves lanceolate, oblong-larceolate or ovate-lanceolate, acute at 
both ends, papillose. Calyx light green, 1" long, winged in fruit. 
Wings triangular-cordate, 2"-2 1 /^" long, usually only one of them 
bearing an ovoid tubercle. Achene 1%," long, dark red, smooth, 
shining, its faces concave. 
Moist soil. Common. April-June. 
5. Rumex crispus L. Curled or Yellow Dock. Perennial, 
glabrous, dark green, stem rather slender, erect, grooved, 12'-42' 
tall. Leaves crisped and wavy-margined, the lower oblong or oblong- 
lanceolate, 6'-12' long, the upper narrowly oblong or lanceolate, 3'-6' 
long, all cordate or obtuse at the base, more or less papillose. Wings 
cordate, l%"-2" long, truncate or notched at base, erose-dentate or 
nearly entire, each bearing a tubercle. Achene 1" long, dark brown, 
shining. 
Waste places. Common. May-July. 
6. Rumex obtusifolius L. Broad-leaved or Bitter Dock. Per¬ 
ennial, glabrous, dark green. Stem stout, erect, grooved, more or 
less scurfy above, 24'-48' tall. Lower leaves oblong-lanceolate, 6'-14' 
long, all cordate or rounded at the base, obtuse or acute at the apex, 
the upper lanceolate or oblong-lanceolate, 2'-6' long, the margins 
somewhat undulate or crisped. Wings hastate, 2"-2%" long, fringed 
with a few, spreading, spiny teeth, one of them bearing an oblong 
tubercle. Achene 1" long, pointed, dark red, smooth, shining, its 
angles slightly margined. 
In waste places. May-August. 
II. POLYGONUM (Tourn.) L. 
Annual or perennial, with enlarged joints and simple, 
alternate, entire leaves. The sheathing stipules often cut or 
fringed. Flowers bi-sexual, usually white or rose-colored. 
Each flower or cluster subtended by a membranaceous 
bract similar to the stipules of the leaves. Calyx mostly 
5-parted, the divisions petal-like, erect and persistent. 
Stamens 3-9. Styles 2-3-parted. Fruit lens-shaped or 3- 
angled. 
1. Polygonum aviculare L. Knot-grass. Annual, pale green or 
bluish green. Stem low or ascending, 4'-24' long. Leaves broad, 
oblong to obovate-oblong, 13"-20" long, narrowed at the base, usually 
acute at the apex or sometimes obtuse. Ocrese silvery. Clusters 
1-5-flowered. Achene 3-angled, ovoid, l%"-2" long, acute, striate, 
reticulated. 
In dooryards and where the ground is trampled. May-September. 
Common. 
