CHARACTERS IN AN UPLAND-EGYPTIAN COTTON HYBRID. £► 
Leaf characters (PL III). — The Pima leaf is much longer and 
broader and has a somewhat greater relative width than that 
of Holdon. The Pima leaf is more deeply lobed, its veins are 
somewhat more divergent, and the basal prolongations of the blade 
which form the sinus around the insertion of the petiole are relatively 
shorter than in the case of Holdon. The Pima leaf is comparatively 
thick and leathery, neatly glabrous (as is also the petiole), somewhat 
shiny of surface, dark olive green in color, and the callus, or pulvinus, 
at the base of the blade is greenish or dull brown, not contrasting 
strongly with the general color of the leaf. In Holdon the leaf is 
comparatively thin and soft, hairy, especially along the veins on the 
lower surface and on the petiole, dull of surface, bright green in color, 
and the color of the callus is red, between maroon and carmine, con- 
trasting sharply with that of the rest of the blade. The nectary on 
the under side of the midvein is elongated and of rather indefinite 
outline in Pima, round, almost heart-shaped, and sharply defined in 
Holdon. The leaf of the first generation hybrid (PI. IV) is interme- 
diate in form but is larger than that of either parent, showing pro- 
nounced heterosis. 
Involucre characters (PI. V, figs. 1 and 3). — The bracts in Pima are 
of crisper texture and more connate near the base than in Holdon. 
The Holdon bracts are more deeply cleft than in Pima, and the teeth 
are relatively broad, leaflike, and nearly erect, while in Pima they 
are slender, bristlelike, and widely spreading. 
Calyx characters (PI. VI). — The Pima calyx is characterized by an 
entire margin, numerous and crowded oil glands, and uniform color, 
while in Holdon the calyx has five large teeth of somewhat unequal 
size, the oil glands are relatively few and scattered, and the margin 
and teeth are of a bright leaf -green color strongly contrasting with the 
pale yellowish green of the rest of the calyx. 
Corolla characters. — The Pima corolla (PL VI, fig. 2) is much 
longer and is relatively much narrower than that of Holdon (PL VI, 
fig. 1), being narrowly funnel shaped when fully expanded, while the 
widely flaring corolla of Holdon is broadly funnel shaped. The 
petals of Pima (PL VII, fig. 3) are pale greenish yellow (35, pi. 5) in 
general color and have a large and very conspicuous Bordeaux red 
(35, pi. 12) spot near the base, while in Holdon (PL VII, fig. 1) the 
petal color is nearest sea-foam green (35, pi. 31) and the spot is 
absent, as is the case in nearly all varieties of upland cotton. 
Stamen characters. — Pima (PL VIII, fig. 3) has much shorter fila- 
ments and somewhat larger anthers than Holdon (PL VIII, fig. 1). 
The color of the anthers, or rather of the pollen, is near empire yel- 
low (35, pi. 4) in Pima, and pale chalcedony yellow (35, pi. 17) in 
Holdon. 
Pistil characters. — The total length of the pistil and the relative 
length of the stigmas, or portion of the pistil projecting above the 
staminal column, are much greater in Pima (PL VIII, li^. 3) than in 
Holdon (PL VIII, fig. 1). The prevailing number of stigmas and of 
locules of the ovary is three in Pima and four or five in Holdon. 
Boll characters. — The usually three-locked boll of Pima (PL IX, 
fig. 3) is approximately conical with a rather narrow base and de- 
creases in diameter somewhat rapidly from below the middle toward 
the apex, ending in a conspicuous but not sharp point. The four or 
five locked Holdon boll (PL IX, fig. 1) is almost globular, with a 
