Petrocosmea dejiangensis, Sheng H. Tang & Jian Xu, 2022

Xu, Jian, Li, Sa, Tang, Sheng-Hu & Ren, Qi-Fei, 2022, Petrocosmea dejiangensis (Gesneriaceae), a new species from Guizhou, China, Phytotaxa 539 (1), pp. 17-23 : 21-22

Key to Petrocosmea dejiangensis and its alliance

1 Corolla light green or white................................................................................................................................................................2

– Corolla blue or purple.........................................................................................................................................................................3

2 Corolla light green, leaf blade 3–7 mm long.................................................. P. viridis Han & Yan Liu in Han et al. (2017: e01566)

– Corolla white, leaf blade 25–40 mm long ..................................................................................... P. cryptica Shaw (2011: 177–179)

3 Leaf blades margins deeply lobed ............................................................................................. P. weiyigangii Wen (2019: 175–183)

– Leaf blades margins not deeply lobed ................................................................................................................................................4

4 Leaf blades narrowly oblanceolate.................................................................................. P. xingyiensis Wei & Wen (2009: 261–262)

– Leaf blades subcordate, suborbicular, ovate, elliptic, or obovate.......................................................................................................5

5 Leaf blades base peltate ............................................................. P. huanjiangensis Yan Liu & W.B.Xu in Xu et al. (2011: 385–387)

– Leaf blades base not peltate................................................................................................................................................................6

6 Leaf blades base cuneate, broadly cuneate or rounded ......................................................................................................................7

– Leaf blades base cordate...................................................................................................................................................................12

7 Filaments straight ...............................................................................................................................................................................8

– Filaments curved near the middle.......................................................................................................................................................9

8 Leaf blades base cuneate ....................................................... P. chiwui M.Q.Han, H.Jiang & Yan Liu in Jiang et al. (2020: e02847)

– Leaf blades base rounded ............................................. P. rotundifolia M.Q.Han, H.Jiang & Yan Liu in Jiang et al. (2020: e02847)

9 Adaxial leaf blades surfaces densely brownish yellow appressed puberulent ..................... P. sericea C.Y.Wu ex Li (1983: 18–27)

– Adaxial leaf blades surfaces densely or sparsely erect pilose, with or without pustulate hairs at the base ....................................10

10 Filaments villous ............. P. shilinensis Y.M.Shui & H.T.Zhao var. changhuensis T.F.Lü & Y.Z.Wang in Li et al. (2019: 145–158)

– Filaments glandular-pubescent .........................................................................................................................................................11

11 Filaments purple, lateral lobes of abaxial corolla lip wide-ovate......................................................................................................... .......................................................................................... P. purpureoglandulosa Y.Dong & Y.Z.Wang in Li et al. (2019: 145–158)

– Filaments white, lateral lobes of abaxial corolla lip triangular ................................... P. minor Hemsley in Hooker (1899: pl. 2600)

12 Filaments glabrous, sparsely pilose, or densely pilose.....................................................................................................................13

– Filaments densely glandular puberulent or glandular pilose............................................................................................................16

13 Filaments glabrous or sparsely pilose........................................... P. leiandra ( Wang 1984: 9–35) Z.J.Qiu in Qiu & Liu (2015: 116)

– Filaments densely pilose...................................................................................................................................................................14

14 Leaf blades 50–150 mm long ........................................................ P. funingensis Qiang Zhang & B.Pan in Zhang et al. (2013: 5–8)

– Leaf blades 10–35 mm long .............................................................................................................................................................15

15 Anthers narrowly ovoid............................................................ P. shilinensis Y.M.Shui & H.T.Zhao in Zhao et al. (2010: 328–330) – Anthers widely triangular ............................................... P. qiruniae M.Q.Han, Li Bing Zhang & Yan Liu in Han et al. (2019: 1–5)

16 Apex of abaxial corolla lip lobes reflexed.................................................... P. duyunensis Sheng H.Tang in Tang et al. (2021: 1–8)

– Apex of abaxial corolla lip lobes not reflexed..................................................................................................................................17

17 Petioles densely villous and golden-brown glandular puberulent................................ P. adenophora Huang & Xin (2021 : e02944)

– Petioles sparsely or densely pilose and lacking glandular hairs.......................................................................................................18

18 Anthers longer than filaments ................................................................................ P. iodioides Hemsley in Hooker (1899: pl. 2599)

– Anthers shorter than filaments, or subequal to filaments in length..................................................................................................19

19 Style bending downward at base ....................................................... P. longituba M.Q.Han & Yan Liu in Li et al. (2019: 145–158)

– Style straight.....................................................................................................................................................................................20

20 Leaf blades margin entire ............................................................. P. qionglaiensis C.Q.Li & Y.Z.Wang in Li et al. (2019: 145–158)

– Leaf blades margin crenate, or crenulate to denticulate ...................................................................................................................21

21 Stigma apex rounded, two dark blue-purple stripes inside the entire corolla tube.......... P. dejiangensis Sheng H.Tang & Jian Xu

– Stigma apex flat, two purple spots inside the tube under stamens ................... P. martini ( Léveillé 1903: 166) Léveillé (1911: 329)