To study the developmental changes of floral characters, young flowers of various sizes from approximately 1 mm long to fully developed were taken from a single individual plant and examined (Figs. 25-31).

Calyx
The shape of the lateral calyx-lobe when the flower length is about 1/3 that of a fully developed flower exhibits the characteristic shape of each species. The shape of the apex of the lateral calyx-lobe is acuminate in the very young stage in L. cyrtobotrya (Fig. 26F) while in the others it is acute or obtuse.

Standard
The shape of the standard is nearly round without a claw or with an attenuate base until the length of the flower is about 5 mm. After that, in L. bicolor (Fig. 25C) and L. cyrtobotrya (Fig. 26C), the part near the auricles elongates, while in L. homoloba (Fig. 27C), L. formosa subsp. velutina (Fig. 28C), L. patens (Fig, 29C), and L. Buergeri (Fig. 30C) the part near the auricles elongates scarcely at all, although the basal part does elongate. As a result, fully developed L. bicolor and L. cyrtobotrya flowers have standards with an attenuate base and L. homoloba Nakai, L. formosa subsp. vehitina, L. patens, and L. Buergeri have standards with a claw.

When flowers are less than 1-1.5 mm long, the auricle near the base of the standard is hardly recognizable urider a binocular microscope, although it becomes distinct when flowers are more than 2 mm long. The development of the auricle in L. bicolor, L. cyrtobotrya, L. formosa subsp. velutina, and L. patens stops when the flower is about 5 mm long, but in L. homoloba and L. Buergeri it continues to develop almost to the anthesis (Fig. 31). The shape of the auricle of the former four species is lunate to narrowly lunate, while the auricle of the latter two is well developed and reniform or broadly lunate.

Wing and Keel-petal
In L. cyrtobotrya (Fig. 26D) the wing is nearly equal to the keel-petal length in very early stages, but when the flower becomes about 5 mm long the wing is longer than the keel-petal. In -L. bicolor (Fig. 25D), L. homoloba (Fig. 27D), L.formosa subsp. velutina (Fig. 28D), L. patens (Fig. 29D), and L. Buergeri (Fig. 3OD) the wing is shorter than the keel-petal throughout growth to anthesis.

The wing-claw and the keel-petal-claw are very short during the very young stage in all flowers. Later, in L. bicolor and L. cyrtobotrya, the claw becomes more welldeveloped than in L. homoloba, L. formosa subsp. velutina, L. patens, and L. Buergeri. When the flower is about 4 mm long, the ratio of the length of the wing-claw to the length of the wing and the ratio of the length of the keel-petal-claw to the length of the keel-petal are larger in L. bicolor and L. cyrtobotrya than in L. homoloba, L. formosa subsp. velutina, L. patens, and L. Buergeri (Fig. 30).

The characters described above are exhibited characteristically from the early stages. Thus, these characters are constant and useful in distinguishing species.