Glycininae, Benth., 1837

Jiang, Kai-Wen, Chen, Yue, Li, Hua-Dong, Ma, Dan-Dan, Pan, Bo, Song, Zhu-Qiu, Wan, Kai-Yuan, Chen, Zheng-Hai & Li, Gen-You, 2023, Weizhia (Fabaceae: Phaseoleae), a new endemic genus from East China supported by morphological and molecular evidence, Phytotaxa 603 (3), pp. 235-248 : 243-244

Key to the genera of subtribe Glycininae

Together with the new genus Weizhia described in this article, subtr. Glycininae comprises 24 genera with ca. 110 species (tr. Psoraleeae is not included), here we update Lackey (1981) ’s key to the genera of subtr. Glycininae :

1. Pods 1-seeded, indehiscent.................................................................................................................................................................2

-. Pods> 1-seeded in general, ± dehiscent.............................................................................................................................................3

2. Plants erect; bracts small ......................................................................................................... tr. Psoraleeae [see Bello et al. (2022)]

-. Twining herbs; bracts membranous, large, leaflike, boat-shaped............................................................................ Phylacium Benn.

3. Stamens alternately aborted; pod hooked with a persistent style ....................................................................... Teramnus P. Browne

-. Stamens all fertile; pods unhooked.....................................................................................................................................................4

4. Stigma a lateral to subterminal sphere on the inside style surface ............................................................ Pachyrhizus Rich. ex DC.

-. Stigma terminal ..................................................................................................................................................................................5

5. Young stems and the axis of the inflorescence strongly angled ................................................................................. Teyleria Backer

-. Young stems and the axis of the inflorescence usually terete, not strongly angled............................................................................6

6. Calyx mouth obliquely truncate without lobes; corolla yellow............................................................................................. Dumasia

-. Calyx with distinct lobes; corolla never yellow .................................................................................................................................7

7. Wing petals with claw equal to or longer than the blade....................................................................................................................8

-. Wing petals with claw usually shorter than the blade ......................................................................................................................11

8. Bracteoles absent, rarely present ........................................................................................................................................................9

-. Bracteoles always present.................................................................................................................................................................10

9. Standard blade broadly obovate-round; wing petals with claw as long as the blade; keel petals acute at apex .................................. ................................................................................................................................................. Afroamphica H. Ohashi & K. Ohashi

-. Standard blade oblong-ovate; wing petals with claw slightly longer than the blade; keel petals obtuse at apex ................................ ............................................................................................................................................................ Amphicarpaea Elliott. ex Nutt.

10. Standard auriculate; stamens monadelphous with the vexillary one coherent with the others except distal free part......................... ................................................................................................................................................. Harashuteria K. Ohashi & H. Ohashi

-. Standard without auricles; stamens diadelphous...................................................................................................... Cologania Kunth

11. Creeping herbs, rooting at nodes ......................................................................................................................................................12

-. Twining, prostrate to erect herbs or subshrubs, generally not rooting at nodes (rarely stoloniferous in Glycine )...........................14

12. Flowers solitary or 2–4 fascicled; pods developing subterraneously by means of the recurved geotropic gynophore ....................... ............................................................................................................................................................................. Neocollettia Hemsl.

-. Flowers in racemes or pseudoracemes; pods (at least the majority) not as above ...........................................................................13

13. Inflorescence a raceme, 1–3-flowered; pods ovate to oblong, 1–3-seeded; plants American............................... Herpyza C. Wright

-. Inflorescence an elongate pseudoraceme, many-flowered; pods terete, 15–20-seeded; plants Asiatic ............................................... ............................................................................................................................................................................. Neustanthus Benth.

14. Leaves 1(–3)-foliolate ......................................................................................................................................................................15

-. Leaves (1–)3–7-foliolate ..................................................................................................................................................................16

15. Pods 1–3-seeded; plants Australian ........................................... Glycine Willd. p.p. ( Glycine remota M. D. Barrett & R. L. Barrett )

-. Pods 5–10-seeded; plants Asiatic .................................................................................................................................... Nogra Merr.

16. Inflorescence a raceme, i.e. 1 flower per node.................................................................................................................................17

-. Inflorescence a pseudoraceme, i.e. 2 or more flowers per node, or less frequently flowers in axillary subsessile fascicles...........19

17. Bracteoles absent ............................................................................................................................................. Neorautanenia Schinz

-. Bracteoles present.............................................................................................................................................................................18

18. Flowers ≥ 12 mm long......................................................................................................................................... Sinodolichos Verdc.

-. Flowers ≤ 9 mm long............................................................................................................................................................... Glycine

19. Bract, bracteoles and calyx-lobes ending in 1–several capitate glands.......................................................................... Eminia Taub.

-. Bract, bracteoles and calyx-lobes without such glands....................................................................................................................20

20. Style differentiated, lower part flattened or ribbon-like, the upper part abruptly slender or if filiform in lower half, then horizontally dilated, the apical part again filiform; seeds with reticulate (faveolate) coating..............................................................................21

-. Style tapered upwards, slender, or if slightly thickened medially, then seeds not as above.............................................................22

21. Inflorescence terminal; style with lower part flattened or ribbon-like; stigma penicillate.................................. Pseudeminia Verdc.

-. Inflorescence axillary; style filiform in lower half, then horizontally dilated, the apical part again filiform; stigma not penicillate. ............................................................................................................................................................... Pseudovigna (Harms) Verdc.

22. Stipules dorsifixed ......................................................................................................................................................... Pueraria DC.

-. Stipules basifixed..............................................................................................................................................................................23

23. Upper teeth of the calyx fused entirely........................................................................................................ Neonotonia J. A. Lackey

-. Upper teeth of the calyx ± separate ..................................................................................................................................................24

24. Pods septate internally, the outer surface transversely furrowed....................................................................... Calopogonium Desv.

-. Pods not septate, the outer surface not transversely furrowed .........................................................................................................25

25. Leaves 3-foliolate; pods with valves not twisted upon dehiscence when mature ...................................................... Toxicopueraria

-. Leaves (3–)5(–7)-foliolate; pods with valves twisted upon dehiscence when mature............................................................ Weizhia