Hilsenbergia labatii

Miller, James S., 2003, Classification of Boraginaceae subfam. Ehretioideae: Resurrection of the genus Hilsenbergia Tausch ex Meisn., Adansonia (3) 25 (2), pp. 151-189 : 157-158

2. Inflorescences paniculate, with a distinct central rachis, many-flowered (northern Madagascar) .... 8. H. labatii

2’. Inflorescences cymose or flowers in fasicles of 1-4 .................................................................................... 3

3. Densely branched shrubs or small trees, leaves less than 2(-3) cm long; fruits less than 5 mm in diam. (southern Madagascar) .............................................................................................................................. 4

3’. More laxely branched shrubs or trees, leaves greater than (2.4-) 3 cm long; fruits greater than 6 mm in diam. ...... 5