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The present investigation was undertaken to study the floral morphology behavior among 22 genotypes of Jasminum sambac. Results revealed that among the different genotypes, cluster bearing habit in terminal position was recorded in genotypes Iruvatchi and IIHR JS - 5, whereas other genotypes recorded forked cymes of cluster flowers in terminal and axillary. Three different shapes of flower bud was recorded among the genotypes, viz. pointed and long, pointed and short, rounded and short. Flower bud colour and colour on flower bud opening was white (155 B or 155 C) and pink tinge on flower bud was recorded in IIHR JS - 5. Star and round shaped flower was observed among different genotypes. Three different types of flowers were recorded, viz., single, double and multi-whorled (3 to 6). Among 22 genotypes, Arka Aradhana recorded longest bud (3.85 cm) and corolla (2.11 cm). The genotype IIHR JS - 5 recorded the longest corolla tube (2.29 cm) and Iruvatchi recorded maximum number of forks per cyme (14). Maximum number of calyx lobe was recorded in Gundumallige (8.79 cm), whereas longest calyx lobe was recorded in Soojimalli (1.49 cm). Bigger size of flower was recorded in Soojimalli (4.64 cm) and maximum number of petals was observed in IIHR JS - 1 (40). The information generated on floral morphological traits in different genotypes will facilitate the planned crop improvement programmes in jasmine.

The present investigation was carried out to study the floral morphology and biology of 5 genotypes during 2016-17. Many flowered cymes both terminal and axillary were observed in J. auriculatum and J. grandiflorum; whereas, cluster bearing flowers in terminal position were observed in J. multiflorum (IIHR JM–1 and IIHR JM–2), J. calophyllum, J. flexile and J. malabaricum. Flower bud was pointed and long in all genotypes; its colour was either green white (157 B) or white (155 C) or white (155 D).Tinge on flower bud was observed in J. grandiflorum (CO.1 Pitchi and Arka Surabhi), J. rigidum, J. nitidum and J. malabaricum. Flower petal tip was either sharp or blunt and flower colour on opening was either white (155 C) or white (155 D) or white with pinkish underneath (155 D) in all the genotypes. Among the 15 genotypes, J. grandiflorum var. CO.1 Pitchi recorded longest flower bud length (4.81 cm) and corolla tube length (2.92 cm); however, maximum corolla length was recorded in J. nitidum (2.15 cm). Maximum number of forks per cymes was recorded in J. auriculatum var. CO.1 Mullai (40.13). Maximum number (6.51) and length of calyx lobe (1.28 cm) was recorded in J. multiflorum –IIHRJM-2 and J. nitidum, respectively. Flower diameter ranged from 1.74 (J. auriculatum-IIHRJA-2) to 4.93 cm (J. nitidum), whereas number of petals varied from 4.97 (J. grandiflorum var. CO.1 Pitchi) to 10.67 (J. nitidum). All genotypes recorded one style per pistil and its length varied from 0.42 cm (J. auriculatum var. CO.2 Mullai) to 2.32 cm (J. grandiflorum var. CO.1 Pitchi). Anthesis and anther dehiscence was recorded earlier in summer months, while, it was delayed during cooler months. However, the peak anthesis was observed from 6:00 to 7:00 p.m. and anther dehiscence from 4:00 to 7:00 p.m. The earliest anthesis was observed in J. auriculatum genotypes and anther dehiscence was observed in J. auriculatum and J. multiflorum genotypes. The stigma was receptive 12 h before an thesis and up to 24 h of anthesis. The maximum receptivity was observed from the time of anthesis to 12 h after anthesis.