Campylotropis luquanensis B.Xu & L.S.Jiang, 2021

Jiang, Li-Sha & Xu, Bo, 2021, Campylotropis luquanensis (Fabaceae: Papilionoideae), a new species from Southwest China, Phytotaxa 524 (2), pp. 114-118 : 114-116

Campylotropis luquanensis B.Xu & L.S.Jiang , sp. nov. ( Figs. 1 & 2 ).

Type:— CHINA. Yunnan: Kunming City , Luquan County, Zhongping Town , elev. 1150–1200 m, growing on the hill slopes, 8 January 2019, Xu Bo 01495 (holotype CDBI!; isotypes CDBI! KUN!) .

Diagnosis:—This new species is similar to Campylotropis grandifolia and C. henryi in distinctly branchlets quadrangular, petioles abaxially angled and often narrowly winged along both sides, stipels absent, leaflets adaxially glabrous, bracteoles usually caducous, but it differs from both in stipules obviously smaller, leaflets abaxially sparsely pubescent obovate to obcordate, inflorescences shorter, and legume with obvious net-veins. Moreover, it is also distinguished from them by usually with 2–4 axillary racemes densely clustered on the second-year brachyblasts, and by its flowering before leaves (hysteranthous).

Shrubs, erect, 1.5–2 (–3) m tall. Branches distinctly irregular quadrangular, with sparse short appressed hairy. Leaves pinnately 3-foliolate, (2.5–) 4–8 (–10) cm; stipules triangular-lanceolate to lanceolate, rarely ovate-triangular, 1.5– 3.5 mm, densely pubescent; stipels absent; petioles abaxially angled and narrowly winged along both sides, densely pubescent, 0.5–2.5 cm; leaflets obovate to obovate-cordate, rarely elliptic or ovate, terminal one 1.5–5 (–7) × 1.5–4.5 cm, adaxially glabrous, abaxially usually sparsely appressed pubescent particularly on veins and margin, midveins distinctly raised, densely appressed pubescent, apex retuse and mucronate, rarely obtuse to rounded, base suborbicular, broadly cuneate, rarely rounded. Inflorescences usually axillary racemose or rarely paniculate, 2–5 cm, usually 2–4 axillary racemes densely clustered on the second-year brachyblasts, peduncles 0.4–1.6 cm, with ± dense appressed to ascending short hairs and sometimes sparsely glandular hairs; pedicels 4–7 mm, rachis and pedicels densely spreading pubescent and glandular hairs. Bracts lanceolate or ovate-lanceolate, 1–2 mm, persistent or caducous, bracteoles usually caducous, linear lanceolate, 1–1.5 mm. Calyx campanulate, 3.5–5 mm, with dense appressed short hairs, tube 1.5–2.8 mm; lobes narrowly triangular and acuminate, 2.2–3 mm, lower lobes narrower and longer than upper and lateral ones, upper lobes connate. Corolla purple; standard elliptic to widely ovate, rarely suborbicular, 9–12 × 6.5–8 mm, apex obtuse, claw ca. 1.5 mm; wings obovate-elliptic, 9.5–11.5 × 3.3–3.7 mm, apex rounded, auricle ca. 1 mm, claw 2.2–2.7 mm; keel incurved, 10–11 × 3–3.5 mm, claw 2–2.5 mm, auricle ca. 0.5 mm. Stamens diadelphous, 8–10 mm, staminal tubes 6–8 mm, free part of filaments 2–3 mm. Pistils 10–11.5 mm; ovary dense puberulent, upper margin with densely ciliate; style incurved, 7.5–8 mm. Legume obliquely ovate to obliquely elliptic, light brown, 6–8 × 3–3.5 mm, obvious brown net-veins; apex rostrate-apiculate, sparsely pubescent. Seeds reniform, ca. 3 × 2 mm.

Phenology: —Flowering before leaves, from December to next March, fruiting from March to April.

Distribution and habitat: — Campylotropis luquanensis is known only from Luquan County in Yunnan Province and Leibo County in Sichuan Province ( Fig. 3 ). It was observed to grow along roadsides, streams, and thickets in hot dry valleys at elevations of 850–1200 m.

Conservation status: —Without extensive exploring the similar habitats in Southwest China, we assessed the conservation status of Campylotropis luquanensis as Data Deficient (DD) according to the IUCN (2019).

Etymology: —The specific epithet luquanensis refers to the county name, Luquan, where the type locality administratively belongs to.

Additional specimens examined: — CHINA. Yunnan: Luquan County, Zhongping Town , elev. ca. 1200 m, 1 April 2009, E . D. Liu 2087 ( KUN) ; Sichuan: Leibo County, Shanlinggang Town, elev. ca. 865 m, 14 April , 2019, Q . Yu et al. CIBYQ056 B004 ( CDBI) .

Taxonomic notes: —In addition to the diagnosis, detailed morphological comparison among Campylotropis luquanensis , C. grandifolia and C. henryi is summarized in Table 1 .

Figures

FIGURE 1. Campylotropis luquanensis. A. Habitat. B. Leaves (adaxial). C. Leaves (abaxial). D. Raceme, showing rachis, peduncle, and pedicels. E. Branch and inflorescence. F. Magnified flower, showing standard, wings, keels, and calyx. G. Infructescence and legumes.

FIGURE 2. Campylotropis luquanensis. A. Branch. B. Quadrangular branchlet. C. Raceme and flowers. D. Standard. E. Wings. F. Keels. G. Stamens, pistils, and calyx. H. Young fruit. I. Stipules. J. Bract and bracteole. Illustration by Mr. Zhen-Long Liang based on the holotype (and H is also drawn in reference to the isotypes).

FIGURE 3. Distribution map of Campylotropis luquanensis (red circles).