56 BOTANICAL GAZETTE [JANUARY 
capitate hairs (#) consist of a stalk of two or three cells and a 
multicellular head, all the cells being thin-walled and frequently 
collapsed. 
Catyx.—The epidermis bears unicellular and capitate hairs of 
the same general structure as those on the leaf. On the calyx tube 
the unicellular hairs are comparatively short and_ thick-walled, 
while on the lobes they are longer and thinner-walled, with corre- 
spondingly broader lumen. The simple bundle running out to the 
tip of each lobe is surrounded by a layer of crystal cells each con- 
taining a crystal averaging 18 p in length. 
CoroLta.—The epidermal cells 
of the petals, at the base, are very 
thin-walled, elongated, and some- 
what sinuous, and bear toward the 
tip papillae with striated cuticle. 
The bundles are very small, often 
but a single spiral vessel marking 
their course. 
STAMENS.—The filaments con- 
sist of delicate cells similar to those 
of the petal in structure. The 
anthers have riblike thickenings 
Fic. 4.—Alfalfa: elements of pod Over their whole surface. 
in surface view; aep, outer epidermis Pistit.—The stigma bears 
with hair scar (x); iep, inner epi- : d 
Gutcaisy of ayiul aye ¥. eben: colorless papillae closely matte 
X 160. together. 
The style is made up of small 
characterless cells except the outer half, which is covered with cells 
slightly thickened, apparently for mechanical support. 
Ovary.—The small thin-walled epidermal cells bear numerous 
thin-walled unicellular and capitate hairs. 
PERICARP (fig. 4).—The epicarp (aep) consists of a single layer 
of empty cells usually more or less elongated except at the stomata, 
about which they form a rosette. Hairs are frequently present, 
but often break off from the dried pod, leaving a scar («) with a 
thickened wall. 
Mesocarp.—The characteristic tissues are: crystal cells (cr) 
