52 BOTANICAL GAZETTE [JULY 
A. Seeds rufous (with a white coating), small (0.82-1.00™ long), one angle 
acute, the others mostly obtuse: capsule small (1.25™™ long), ovate, 
rather acutely angled, glabrous or hairy: flowers in lateral clusters : stems 
prostrate (or erect in £. glyptosperma). 
Seeds strongly furrowed, angles usually crenate: stems and capsule 
. glabrous, the latter acutely angled: appendages white. £. glyAiosperma. 
Seeds lightly furrowed: stems and capsule hairy. 
Leaves elliptical (12-14™™ long): seeds sic spies furrows, gran- 
ulate: involucre cleft down one side. E. humifusa Engelm. 
Leaves oblong-linear (g™ or less): seeds transversely ae slightly 
cellular-papillose: involucre not cleft; appendages usually pink. 
E. maculata L. 
. Seeds black (with a white coating), larger (1.12-1.25™™ long): capsule 
larger (1.75-2.25™™ long), rous: flower clusters terminal: stems 
erect, ascending or decumbe 
to 
Capsule ovate (2.25™™ a rather sharply angled, rounded at sum- 
mit: seeds oval, very obtusely angled (1.77™" wide), covered with short 
and sharp irregular ridges: stems erect or ascending, stout, glabrous 
or nearly so (25-40™ long): leaves 20-3 sie er dark-green, usually 
with a central red spot - E. nutans Lag. 
paceon very broadly oblong or broadly oval, smaller (1.75™" long, 
wide), retuse, very obtusely angled: seeds oblong, more acutely 
eee (0.67—-0.70™™ wide) and with a few shallow furrows or nearly 
even: stems slender, diffusely much branched, decumbent, hirsute: 
leaves smaller (8—18™™ long), light-green, rarely with a central red spot. 
E. hirsuta (Torr.) 
— Kari McKay WIieGAnNpD, Cornell University. 
EXPLANATION OF PLATE III. —Fig. 1, &. hirsuta, plant natural size. 
Fig. 2, involucre. Fig. 3, capsule. Fig. 4, same in cross section, Fig. 5, 
seeds. Figs. 6 and 7, capsule of £. mutans. Fig. 8, seeds of the same. 
(EDEMA IN ROOTS OF SALIX NIGRA. 
Many species of Salix when growing along streams or ponds will 
form masses of roots differing much from those growing in the soil. 
The roots arise, as a rule, from near the base of the trunk. They are 
long and straight and have but few branches. Their structure is some- 
what modified because of their unusual environment. Around the 
central cylinder is a loose cortex of parenchymatous cells supplied with 
