Ehretioideae

Miller, James S., 2003, Classification of Boraginaceae subfam. Ehretioideae: Resurrection of the genus Hilsenbergia Tausch ex Meisn., Adansonia (3) 25 (2), pp. 151-189 : 154

Key to genera of Ehretioideae

1. Fruits dry, of 4 separate nutlets; North and South American deserts .............................................. Tiquilia

1’. Fruits fleshy, at least when young ............................................................................................................ 2

2. Leaves sclerophyllous; low shrubs ............................................................................................................ 3

2’. Leaves membranaceous to coriaceous; erect shrubs or trees ...................................................................... 4

3. Anthers free; Argentina.................................................................................................................. Cortesia

3’. Anthers connate in a cone surrounding the style; Australia.......................................................... Halgania

4. Flowers unisexual, the plants dioecious; New World tropics .................................................................... 5

4’. Flowers all bisexual; the plants hermaphroditic ........................................................................................ 6

5. Plants without spines; endocarps remaining entire at maturity .............................................. Lepidocordia

5’. Plants with spines; endocarps dividing into 4 single-seeded pyrenes at maturity ...................... Rochefortia

6. Calyx lobes imbricate; outer surface of endocarp smooth to ridged ............................................ Ehretia s.l.

6’. Calyx lobes valvate; outer surface of endocarp ridged to winged .............................................................. 7

7. Corollas urceolate to campanulate; Africa and Indian Ocean Islands ...................................... Hilsenbergia

7’. Corollas rotate to funnelform; Neotropics .................................................................................. Bourreria