iqiq] stout— intersexes 133 



23. Riddle, Oscar, The theory of sex as stated in terms of results of studies 

 on pigeons. Science N.S. 46:19-24. 1917. » 



24. SCHULZ, August, Beitrage zur Kenntniss der Bestaubungseinrichtungen 

 und Geschlechtsvertheilung bei den Pflanzen. Bibl. Bot. 2: Heft 10, 

 1-103. 1888. 



25. Stout, A. B., Self- and cross-poUinations in Cichorium Intyhus with refer- 

 ence to sterility. Mem. N.Y. Bot. Card. 6:333-454. 1916. 



26. Strasburger, E., Neue Untersuchungen iiber den Befruchtungsvorgang 

 bei den Phanerogamen als Grundlage ftir eine Theorie der Zeugung. 1884. 



EXPLANATION OF PLATES XII, XIII 



PLATE XII 



Flowers X 2 . 5 ; stamens X 7 . 5 ; microspores X 1 10 



Figs. 1-3. — Flower, anther, and pollen of typical first form hermaphro- 

 dite. 



Figs. 4-6. — From typical second form hermaphrodite. 



Figs. 7-10. — Flowers, stamens, and petals of females of closed corolla 

 type. 



Figs. 11-35. — From various intersexes each having flowers decidedly 

 uniform. 



Figs. 36-4S. — Illustrate various grades of intersexuality appearing among 

 stamens and flowers produced by single individuals. 



PLATE XIII 



From photograph taken June 19, 1916, showing spikes at about one- 

 half natural size. 



Fig. 49. — Typical spike of first form hermaphrodite. 



Fig. 50. — Spikes of plant no. 11; stamens differing slightly from those 

 of first form hermaphrodite. 



Fig. 51. — Spike of plant no. 37 ; all filaments short and of unequal lengths. 



Fig. 52. — Spikes of typical second form hermaphrodite. 



Fig. 53. — Three spikes from plant no. 39. 



Fig. 54. — Spikes from plant no. 20; large non-dehiscent anthers con- 

 spicuous. 



Fig. 55. — Spikes showing wide variation in character of stamens; many 

 stamen forms present in flowers throughout entire spike; showing well reflexed 

 corolla lobes. 



Fig. 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. 



Fig. 57. — Three spikes of various ages from female plant of closed corolla 

 tjT^e; spike at right full of ripe seed. 



