20 Papaya
longitudinal strips that change from white to yellow when it ripens. It is harder than
C. candamarcensis and the fruits though small are reported to contain a greater
percentage of papain than C. papaya.
C. gracilis: It is a small slender ornamental species. It has compound leaves of five
leaflets and each leaflet having wavy indentations, the middle leaflet being three.
C. monoica : (Desf): Monoecious plant, susceptible to virus.
C. microcapra : (Jacq): Dioecious plant, susceptible to virus.
C. cauliflora : (Jacq): Dioecious plant, resistance to virus (Figure 2.3).
C. goudotiana : (Solms-Lauback): Dioecious plant, susceptible to virus.
C. parviflora : (Solms): Dioecious plant, susceptible to virus
C. pennata : (Heilborn, Siensk): Dioecious plant, resistant to frost.
C. pubescens : (Lenne et Koch): Dioecious plant, resistant to distortion ringspot virus.
C. stipulate : (Badillo): Dioecious plant, resistant distortion ringspot virus.
C. horovitziana : (Badillo): Dioecious plant, susceptible to virus.
C. candicans : (Gray): Dioecious plant, resistant to distortion ringspot virus.
C. pentagona : (Heilorn): Dioecious plant resistant to frost.C. cauliflora (Figure 2.3) is resistant to viruses, while C. candamarcensis and
C. pentagonia are resistant to frost (Singh 1964). According to their crossibility, these
species can be arranged in three groups; Group A: C. monoica, C. microcarpa,
C. cauliflora and C. candamarcensis, Group B: C. papaya and Group C: C. goudotiana.
All the species in Group A are easily crossable with each other and produce viable
seeds. Crosses between species in Group A and B do not form mature seed but immature
FIGURE 2.3 (See colour insert.) V. cauliflora tree in fruiting.