23 
and in general appearance this form is the same as the male or the 
hermaphroditic males forbesii and correaB. 
Form 1 1 . Ernstii of Solms-Laubach. From the description given 
by Ernst 1 this appears to represent the coexistence on 'the same 
tree of pistillate flowers and of hermaphrodite flowers of the same 
characters as those of form 4. No staminate flowers were found by 
Ernst on such trees. He states: "Papaya has three different kinds 
of flowers — staminiferous, pistilliferous, and hermaphrodite. The 
latter two are found on the same tree, whereas the stamen-bearing 
flowers grow exclusively on distinct individuals." He found her- 
maphrodite flowers "on all the female trees examined, though never 
in great numbers." In his description these hermaphrodite flowers 
are stated to be gamopetalous (in contradistinction to the pistillate, 
which he regarded as polypetalous) and to possess an ovoid corolla 
tube in the throat of which the stamens are inserted. This distribu- 
tion of the sexes has not been noted in Hawaii. 
Form 12. A tree similar to the above but bearing staminate 
flowers as well as pistillate and hermaphrodite was seen by one of the 
writers a few years ago at this station. Whether the pollen from the 
staminate flowers was incapable of fecundating any pistil was not 
determined. 
Form 13. Pistillate and staminate flowers on the same tree. 
Recorded by Iorns (see p. 25). 
SUMMARY OF FORMS. 
To summarize briefly, there may be said to be the following forms : 
1. The female of the dioecious papaya. 
2. The male of the dioecious papaya. 
3. The correae form of andromoncecious papaya, with its elongated 
corolla tube and 10 stamens in the throat; flower clusters and other 
characters like male. 
4. The elongata form with its hermaphrodite flowers like those of 
correae and its staminate flowers nonfunctioning; flower clusters 
short; fruits elongated, tending to cylindrical shape. 
5. The sterile hermaphrodite, similar to 4, but without fruits. 
6. The forbesii form of andromoncecious papaya, with its stamens 
in the hermaphrodite flower reduced to five in number, and these 
attached by long filaments to the shortened corolla tube near the 
base of the ovary; flower clusters and other characters like male. 
7. The pentandria form with its hermaphrodite flowers like those 
of forbesii, staminate flowers nonfunctioning; flower clusters short; 
fruit generally club-shaped or obovate and furrowed. 
8. The coexistence of forms 4 and 7 in the same plant. 
i A. Ernst. Jour. Hot. [I.ond.n], 4 (1866), pp. 81-83. 
