40 BULLETIN 1164, U. S. DEPARTMENT OF AGRICULTURE. 
several of the F, individuals (PL IX, fig. 7). Extremely narrow corol 
las were also met with in F 2 , the corolla index (width as a percentage 
of the length) having ranged as low as 22, while in Pima the minimurr. 
was 59 and in Holdon it was 95. 
Other extraparental variations, chiefly in characters not determined 
by measurement or grading, were noted as having appeared in one 
or more of the F, plants. Several of these were so remarkable as to 
differentiate the plants exhibiting them from any commonly cultivated 
type of cotton. In some cases the character as a whole, in other 
cases the degree of its expression, were extraparental. The most 
striking were: 
Excessively numerous vegetative branches or limbs (PI. XIII, rig. 1). 
Absence of a sharp differentiation, at high nodes of the axis, between vegetative 
and fruiting branches. 
Red color present in the stems, leaves, and involucres to a much greater extent 
than in any individual of the parental populations. 
Bluish glaucous color of the stems and foliage (PL XIII, fig. 1). 
Color of the foliage lighter green than in Holdon (PL XII, fig. 2) or darker green 
than in Pima (PL XV, fig. 1). In some of the light-green plants the leaves had a 
yellowish hue, and in at least one individual (PL XXI, fig. 3) a tendency to chlorosis 
was noticeable. 
Leaves thinner than in the Holdon parental race or thicker than in the Pima 
parental race, being almost coriaceous in some of the F 2 individuals. 
Leaves of the middle zone of the axis only three lobed, in one individual some of 
them entire (PL XII, fig. 1; PL XIII, figs. 2 and 3; PL XVII, fig. 1; PL XIX, fig. 1), 
while in the parent races the corresponding leaves are five lobed. 
Deflexed instead of an approximately horizontal position of the whole leaf blade. 
Deflexed or pendent position of the terminal lobe only, the rest of the leaf blade 
being approximately horizontal. 
Terminal lobe twisted so as to occupy a plane almost at right angles to that of 
the remainder of the leaf blade. 
Petiole twisted so as to reverse the usual position of the dorsal and ventral surfaces 
of the leaf blade (PL XIV, fig. 1). 
Leaf margin sinuate or fluted (PL XIII, fig. 2: PL XV, figs. 1 and 2; PL XVII, 
fig. 2), characters not expressed in either parental population and but faintly so in 
Fj. In the F 2 population 29 of the 215 individuals showed a more pronounced 
expression of the characters than any of the F,, and in several F 2 individuals the 
crinkled or wavy condition was extremely conspicuous. 27 
Leaf lobes, especially the terminal lobe, conspicuously toothed or notched, (PL 
XVIII, fig. 1), a character which is frequent in sea-island cotton but of rather rare 
occurrence in Pima while in Holdon it has not been observed. 
Leaf lobes constricted at the base (PL XX, fig. 1). 
Leaf blade deeply cupped by the upward cur vino; of the margin (PL XVII, fig. 2). 
Leaf lobes terminating in threadlike tips (PL XX, fig. 2). 
Extreme hairiness, with the hairs either much longer or much more numerous 
and feltlike than in Holdon, the hairy parent. In one individual the hairiness 
extended to the young bolls. 
Calyx having one or two excessively long teeth. In one individual a portion of 
the caiyx was transformed into a bractlike structure having two or three teeth. 
Outer corners of the petals washed with red. This variation in petal color was 
not observed in newly opened flowers of the parental varieties, although in both 
Pima and Holdon when the flowers begin to wither the petals turn red. 
Pistil exserted in the bud, a character sometimes associated with malformation of 
the corolla. 28 
Stigmas bent (PL VIII, fig. 8) sometimes at a right angle to the column. 
Occurrence of six-locked bolls, noted in one individual onlv. 
Surface of the boll very rough (PL IX, figs. 10, 13, 18), the" pits in which the oil 
glands are situated being very large and deep. 
27 Fyson (JO, p. 12 and fig. 10) notes the occurrence of wariness of the leaf margin as an extraparental 
character in a hybrid between two species of cotton grown in India (Gossypium herbaceum and G. 
neglectum) . 
' 2 3 j. h. Kempton calls attention to the fact that exsertion of the pistil in the bud is normal in 
Thurberio. thespeswidea,a plant allied to Gossypium which is native in the mountains of southern Arizona 
and in adjacent portions of Mexico. 
