Diabelia, Landrein, 2010

Landrein, Sven, 2010, Diabelia, a new genus of tribe Linnaeeae subtribe Linnaeinae (Caprifoliaceae), Phytotaxa 3, pp. 34-38 : 37-38

Key to the species of Diabelia and the genera of Caprifoliaceae tribe Linnaeeae subtribe Linnaeinae

1 Inflorescence terminal of pair of flowers, these opening simultaneously .................................................................... 2

- Inflorescence terminal or axillary of single flowers or paired flowers but these not opening simultaneously ............ 4

2 Calyx lobes five or four with a fifth shorter one. Corolla usually white (sometimes red) ........................................... 3

- Calyx lobes usually two. Corolla usually yellow (sometimes red) spotted orange in the throat......... Diabelia serrata

3 Calyx lobes five. Corolla long tubular, yellow to white (sometimes red) ..................................... Diabelia spathulata

- Calyx lobes five but one lobe reduced giving the appearance of four. Corolla tube very long and flowers about two weeks earlier than D. spathulata ................................................................................................... Diabelia tetrasepala

4 Inflorescence of paired flowers opening consecutively................................................................................................ 5

- Inflorescence of single flowers ..................................................................................................................................... 6

5 Inflorescence at the end of short branches. Bracts covered with bristles, becoming woody and fused to the ovaries in fruit. Corolla bilabiate, stamens and style only sligthly exserted. Flowers not fragrant............................... Kolkwitzia

- Inflorescence at the end of long branches forming a large terminal panicle. Bracts unconspicuous. Corolla infundibuliform, sub regular, stamens and style exserted from the corolla. Flowers fragrant ........................... Abelia

6 Creeping subshrub, inflorescence reduced to two single flowers, two bracts shield like and covered with glandular hairs. Corolla infundibuliform. Calyx deciduous ............................................................................................ Linnaea

- Erect shrubs, inflorescence with more than two flowers, bracts not shield like and covered with glandular hairs. Corolla tubular or bilabiate ........................................................................................................................................... 7

7 Bracts accrescent in fruit, wing like or woody and covered in bristles. Calyx small and not accrescent in fruit ........ 8

- Bracts unconspicuous and not accrescent in fruit. Calyx large and accrescent in fruit................................................ 9

8 Two bracts accrescent and becoming dry and broadly winged in fruit. Ovary 4-locular with two fertile locules ......... .......................................................................................................................................................................... Dipelta

- Bracts covered with bristles and becoming woody and fused to the ovaries in fruit. Ovary 3-4-locular with 1-2 fertile locules. .......................................................................................................................................................... Kolkwitzia

9 Corolla long tubular more or less bilabiate, red coloured and not gibbous at base. Nectary four lines of compact glandular hairs located in grooves in the corolla tube. Flowers appearing at the end of short shoots. Mexico............. ........................................................................................................................................................................... Vesalea

- Corolla bilabiate and gibbous at base, white to pink. Flowers appearing at the end of long branches sometimes in a large panicle. China............................................................................................................................................. Abelia