<i>Hibiscus</i> 属植物に関する研究 (第9報)

Abstract

1. The flower type of syriacus was classified into 3 groups and 9 types based on the investigation of 54 different clones.Group I. Single flowered type (25 clones)I-a Narrow petal type (7 clones)I-b Medium petal type (13 clones)I-c Broad petal type (5 clones)Group II. Semi-double flowered type (20 clones)II-a Gion-mamori type (4 clones)II-b Hanagasa type (7 clones)II-c Rose type (9 clones)Group III. Double flowered type (9 clones)III-a Irregular type (2 clones)III-b Chrysanthemum type (3 clones)III-c Pompon type (4 clones)2. The Group I (Single flowered type) could also be divided into three sub-groups according to the number of petals per flower, viz. i) number of petals 5 (basic number) (9 clones), ii) number of petals 5-6 (12 clones) and iii) number of petals 8-11 (4 clones). Even in flowers with petals twice as many as the basic number, petals were of the same size as basic one and were arranged in a single row, so that the flowers remained single in appearance. The size of flower was the most variable in this group, ranging continuously from 7.6 to 13.3cm in diameter (Table 1, Fig. 1, 2, 3 and 6).3. The Group II (Semi-double flowered type) consisted of flower type in which inner petals were much smaller than outer single-row petals. Those with a small number of inner petals were classified as Type II-a (Gion-mamori), while those with large number of inner petals as Type II-b (Hanagasa). In Type II-c (Rose), inner petals were somewhat larger in size than II-a and b and some of them were originated from the style. Type II-a was as fertile as the flowers of Group I, while II-b rarely produced seeds and II-c never produced seeds (Table 2, Fig. 4 and 5).4. In Group III (Double flowered type) inner and outer petals were of the same size. In Type III-a (Irregular), styles of about 1/3 of the flowers were transformed into petals. In Type III-b (Chrysanthemum), petals were rather smaller and were more or less regularly arranged, and styles of 1/2-2/3 of the flowers turned into petals. In Type III-c (PomPon), the small spherical flowers possessed the smallest but numerous petals, and the whole style was transformed into petals. Some examples of prolification were found in the last type; such flowers consists of more than 70 petals (Table 3, Fig. 7 and 8).