T919] STOUT—INTERSEX ES 133 
23. Ripprx, Oscar, The theory of sex as stated in terms of results of studies 
on pigeons. Science N.S. 46:19-24. 1917. 
Scuutz, Aucust, Beitrage zur Kenntniss der Bestaubungseinrichtungen 
und Geschlechtsvertheilung bei den Pflanzen. Bibl. Bot. 2: Heft 10, 
i) 
3 
1-103. 1888. 
. Stout, A. B., Self- and cross-pollinations in Cichorium Intybus with refer- 
ence to sterility. Mem. N.Y. Bot. Gard. 6:333-454. 1916. 
. STRASBURGER, E., Neue Untersuchungen tiber den Befruchtungsvorgang 
bei den Phanerogamen als Grundlage fiir eine Theorie der Zeugung. 1884. 
. 
EXPLANATION OF PLATES XII, XIII 
PLATE XII 
Flowers X2.5; stamens X7.5; microspores. X 110 
Fics. 1-3.—Flower, anther, and pollen of typical first form hermaphro- 
is) 
un 
iS) 
n 
Fics. 4-6.—From typical second form hermaphrodite. 
Fics. 7-10.—Flowers, stamens, and petals of females of closed corolla 
Fics. 11-35.—From various intersexes each having flowers decidedly 
Fics. 36-48.—lIllustrate various grades of intersexuality appearing among 
stamens and flowers produced by single individuals. 
PLATE XIll 
From photograph taken June 19, 1916, showing spikes at about one- 
half natural size. 
Fic. 49.—Typical spike of first form hermaphrodite. 
Fic. 50.—Spikes of plant no. 11, stamens differing slightly from those 
of-first form hermaphrodite. 
Fic. 51.—Spike of plant no. 37; all filaments short and of unequal lengths. 
Fic. 52.—Spikes of typical second form hermaphrodite. 
Fic. 53.—Three spikes from plant no. 30. 
Fic. 54.—Spikes from plant no. 20, large non-dehiscent anthers con- 
spicuous. 
Fic. 55.—Spikes showing wide variation in character of stamens; many 
stamen forms present in flowers throughout entire spike; showing well reflexed 
corolla lobes. 
Fic. 56.—Spikes of plant no. 46; flowers for drawings nos. 46, 47, and 48 
taken from middle of spike at right; also showing elongated pistils as fre- 
quently developed. 
IG. 57.—Three spikes of various ages 
type; spike at right full of ripe seed. 
from female plant of closed corolla 
