Pleurospermum lecomteanum H.Wolff, 1929, Repert. Spec. Nov. Regni Veg. 27: 116.

Zhou, Jing, Niu, Junmei, Wang, Xinyue, Zhou, Shilin & Liu, Zhenwen, 2022, Resurrection of Pleurospermum lecomteanum H. Wolff (Apiaceae) based on molecular and morphological evidence, PhytoKeys 212, pp. 1-11 : 1

Pleurospermum lecomteanum H.Wolff, 1929, Repert. Spec. Nov. Regni Veg. 27: 116.

Type.

China. Su-tchuen [Sichuan]: Bassin de Tongho (M.Thibet), Dzenla , roches metamorph., 3500 m, prairies alpines, 24 September 1911, A.F. Legendre 1537 (lectotype P! barcode P00834556, designated by Pimenov, Kljuykov, 2000a: 550); Su-tchuen [Sichuan]: Bassin de Tong-ho (M.Thibet) Tse minuda, terrain schistos., 4500 m, 04 October 1911, A.F. Legendre 1603 (syntype P! barcode P00834557); Sze-ch’uan [Sichuan]: reg. bor.-occid., Dalgang cia. 50 km VSV von Merge, 3500 m, 03 September 1922, H. Smith 4313 (lectotype GB! barcode GB0048821; isolectotype UPS!) .

Other specimens examined.

China. Qinghai: Jiuzhi , 4100 m, 20 August 2019, J. Zhou, J. Wei & Y.Z. Gao G034, G036, G037, G039 (KUN) ; Sichuan: Hongyuan , 3600 m, 25 August 2005, J. Zhou & L.Q. Fang ZJ0624 (KUN) .

Description.

Herbs perennial, 10-25 cm tall. Taproot long conic, simple. Stem erect, ribbed, sometimes shortened, bases with remnant sheaths. Basal and lower leaves petiolate; petioles 3-6 cm, petiole base sheathing, oblong, ca. 1.5-2 cm long; blade oblong in outline, 2-3-pinnatisect; pinnae 4-8 pairs, short petiolulate or subsessile; ultimate segment narrowly ovate or lanceolate, 3-5 × 1-1.5 mm, entire or 2-3-lobed. Upper leaves smaller and reduced, sheath prominent. Umbels compound, terminal or lateral; bracts 4-6, leaf-like, 2-6 cm long; rays 8-15, 1-7 cm long, unequal or equal; bracteoles 6-8, broadly ovate, similar to bracts, margin broadly white membranous, apex pinnate, longer than the flowers. Calyx teeth triangular, 0.5 mm long. Petals white, or purple, oblong-obovate, apex acute, short incurved. Stylopodium flat; styles longer than stylopodium. Fruit oblong, slightly compressed laterally; ribs prominent, broadly winged; vittae 1 in each furrow, 2 on commissure. Fl. Aug-Sep, fr. Sep-Oct.

Note.

In flora of China, Pleurospermum wilsonii was described as 2-3-ternate-pinnate ( Pan and Watson 2005). However, the type specimens and the protologues for it and its synonymous species, P. crassicaule , show that their leaf blades are "simpliciter pinnata" or "1- vel subbipinnatisecta" ( Boissieu 1906; Wolff 1925). For Pleurospermum cnidiifolium , H. Wolff described its blades as "bi- vel subtripinnatipartita", but the type has 1-pinnate (PE00033257), or 2-pinnatisect (GB0048821). After careful examination of GB0048821, we considered that its morphology was more similar to P. lecomteanum. That is, for P. cnidiifolium , the type PE00033257 should be selected, while GB0048821 should be put under P. lecomteanum . Our population in Chayu County of Tibet with variable leaf morphology (1-pinnate or subbipinnatisect) yielded identical ITS sequences. Therefore, with the resurrection of P. lecomteanum , the description for P. wilsonii should be revised as: blades 1-pinnate or subbipinnatisect, ultimate segments ovate or suborbicular, 7-14 × 4-10 mm, base cuneate, margins irregularly serrate to deeply lobed, rays 10-25, subequal. Furthermore, Pleurospermum lecomteanum occurs in the open grasslands in Yunnan, Sichuan, Gansu and Qinghai provinces of China, while P. wilsonii is on the south slope of mountains in Sichuan, Qinghai and Xizang provinces of China.