Indigofera arrecta Hochst. ex A.Rich. (1847)

Adema, F., 2011, Notes on Malesian Fabaceae (Leguminosae- Papilionoideae) 15. Notes on Indigofera, Blumea 56 (3), pp. 270-272 : 271

Indigofera arrecta Hochst. ex A.Rich. (1847) 184. — Lectotype (Schrire, here designated): Schimper III 1923 b ( P 00569218 ; iso K, L, LE, MO, P), Ethiopia, Tigray Region, Adoa , Oct. 1842.

Indigofera colutea (Burm.f.) Merr.

Contrary to the statement by De Kort & Thijsse (1984: 115) biramous hairs in this species may have arms of unequal length. The biramous hairs of the upper surface of the leaflets are ± spreading, 0.4 – 0.6 mm long, with unequally long arms, those of the lower surface of the leaflets are appressed, 1.0 – 1.5 mm long, with equally long arms. The glandular hairs often differ in length within as well as amongst specimens. In the Flora Malesiana area they are fairly uniform, the longest hairs on twigs are 0.1–0.8 mm long and on pods 0.1– 0.3 mm long. In Australia the longest hairs on twigs are similar to those of specimens of the Flora Malesiana area, but up to 1.1 mm long; in continental Asia they are 0.5–1.7 mm long; in Africa 0.6– 2.5(–5) mm long. There the longest glandular hairs of specimens present in L are found in Stolz 694 (4– 5 mm) and Tanner 3142 (3.5– 4 mm). As these two specimens have pods with few endocarp spots they may belong to I. zenkeri Harms. The type specimen of I. zenkeri has glandular hairs up to 4 mm long.

Several specimens from the Lesser Sunda Islands (Cinatti 108, Iboet 123, Jaag 417, Pleyte 93, Spanoghe s.n.) have very few or no glandular hairs. Identification of such specimens by means of the key in De Kort & Thijsse (1984) may lead to I. suffruticosa .

Indigofera erectifructa Y.Endo, H.Ohashi & Madulid

In 2005 Endo et al. described a new species of Indigofera from Luzon: I. erectifructa . The fruits of this species are almost erect and therefore the authors made a comparison with erect-fruited species such as I. galegoides DC. , I. doachengensis Y.Y.Fang & C.Z.Zheng and I. densifructa Y.Y.Fang & C.Z.Zheng ( Endo et al. 2005) . The unknown plants were clearly different from these species and a new species was described. Although the authors consulted the treatment by De Kort & Thijsse (1984) no comparison was made with species recorded for the Philippines. Amongst others De Kort & Thijsse’s new species I. luzoniensis has ± erect fruits, called ‘ascending’ by De Kort & Thijsse (1984: 127). After receiving the type material of I. erectifructa on loan a careful analysis of the characters showed that the differences between I. erectifructa and I. luzoniensis are very small. Although the important seed character could not be assessed, due to the few pods available, I am convinced that Nemoto et al. 10630, the type of I. erectifructa , belongs to I. luzoniensis . The synonymy of I. luzoniensis becomes: