Cynoglossum

Miller, James S., 2005, A synopsis of the genus Cynoglossum L. (Boraginaceae) in Madagascar and the Comoro Islands, Adansonia (3) 27 (1), pp. 113-127 : 115

Key to the Malagasy species of Cynoglossum

1. Nutlets glabrous on the dorsal surface or glochidiate on a marginal wing and/or with a median line or scattered glochidia .................................................................................................................................... 2

1’. Nutlets more or less evenly glochidiate on the dorsal surface .................................................................... 5

2. Fruits less than 6 mm in diam.; nutlets less than 3 mm broad .................................................................. 3

2’. Fruits c. 10 mm in diam.; nutlets c. 5 mm broad ...................................................................................... 4

3. Basal leaves obtuse to rounded at the base and then abruptly decurrent along the petiole for 5-10 mm; leaf margin minutely erose to undulate with magnification .................................................... 4. C. lowryanum

3’. Basal leaves attenuate at the base; leaf margin entire ............................................................ 2. C. cernuum

4. Basal leaf blades narrowly elliptic to lanceolate, 11-17(-20) cm long, apex acute to slightly acuminate; petioles 10-20 cm long .............................................................................................. 6. C. tsaratananense

4’. Basal leaf blades oblanceolate, 2.5-5.5 cm long, apex obtuse to rounded; petioles 1.5-3.5 cm long ......................................................................................................................................................1. C. birkinshawii

5. Leaf margin unevenly serrate or minutely erose ........................................................................................ 6

5’. Leaf margin more or less entire ...................................................................................... 3. C. lanceolatum

6. Lower leaves clustered in a basal rosette, the base obtuse to rounded and then abruptly decurrent along the petiole for 5-10 mm; leaf margin minutely erose to undulate with magnification ............ 4. C. lowryanum

6’. Lower leaves not clustered in a rosette, the base clasping; leaf margin unevenly serrate, sometimes minutely so .............................................................................................................................. 5. C. monophlebium

1. Cynoglossum birkinshawii J.S.Mill. , sp. nov.