Elwendia bucharica Kljuykov & Lyskov, 2018

Kljuykov, Eugene, Ukrainskaja, Uliana & Lyskov, Dmitry, 2018, Two new species of Elwendia (Apiaceae) from Uzbekistan, Phytotaxa 382 (2), pp. 213-220 : 214

Elwendia bucharica Kljuykov & Lyskov sp. nov. ( Fig. 1 , 3a , 4a , Table 1)

The new species differs from E. capusii in shorter terminal leaf lobes (1–4 mm vs. 10–40 mm), bracteoles (wanting or 1–3 herbaceous bracteoles vs. (3) 5–8 bracteoles with membranous margins), pedicels (2–3 mm long, ribbed, slightly thickened vs. up to 5 mm long, tiny, terete), and the number of secretory ducts in petals (several vs. solitary).

Type: — UZBEKISTAN. Southern side of Hissar Range, near Xojaosmin, upper reaches of Xondiza River (38.626° N, 67.606° E), 07 May 1979, Pimenov, Kljuykov, Boryaev, Baranova et Vasilyeva 483 (holotype MW 0595669, isotype MW 0595670).

Polycarpic herbaceous plant with tuberous root, all glabrous; tuberous root obovate, up to 2 cm ⌀. Stems 10–15 cm tall and about 1–2 mm ⌀ at base, solitary, solid, angular-ribbed in lower part, tiny-ribbed under umbels, bifurcated from lower stem part, lower internodes short. Radical leaves petiolate; leaf blades 2–3.5 cm long, 2.5–3 cm wide, triangular or rhombic, 3–4-ternate; basal segments with petiolulate 7–9 mm long, terminal segments lanceolate or obovate, deeply dissected into linear or lanceolate 1–4 mm long lobes; lower stem leaves sessile or with short, utricular, lanceolate or linear-lanceolate sheaths; 2–3-pinnate, leaf blades smaller than radical leaves; upper stem leaves with narrow sheaths, leaf blades pinnate, terminal lobes filiform, 3–4 mm long. Umbels 4–5 cm ⌀, with 3–4 tiny, ribbed, equal rays up to 3.5 cm long, bracts wanting. Central umbel located at same level as terminal umbels of lateral branches. Umbellets 7–10 mm ⌀, up to 8–10 flowers, pedicels slightly unequal, thickened, ribbed, up to 3 mm long; bracteoles wanting or 1–3 narrowly linear, entire; calyx teeth obscure, petals white, 1.2–1.5 mm long, obovate, with narrow notch, elongate narrow curved apex, and several secretory ducts. Fruits nearly cylindrical ( Fig. 3a , 4a ); mericarps homomorphic, terete, 3–4 × 0.8–1 mm; only primary ribs present; all ribs equal, filiform, straight, with entire margin; stylopods low conical; styles 1–1.2 mm long, suberect; commissure broad; vascular bundles thin; secretory ducts single between ribs; two secretory ducts on commissural side; endosperm flat at commissural side.

Additional specimens examined (paratypes): — UZBEKISTAN. Hissar Range , valley of Sangardak River, upper reaches of Oqsuv River (38.650° N, 67.383° E), juniper community, 5 June 1948, Pyataeva 208 ( TASH) ; Toʻpolon River basin, Maland pass (38.618° N, 67.654° E), 17 June 1948, Pyataeva 471 ( TASH) .

Etymology: —The specific epithet refers to the Khanate of Bukhara, a Central Asian state that existed from the second quarter of the 16th century to the late 18th century and included the territory from which the plants were collected.

Phenology: —Flowering in April or May; fruiting in June.

Distribution area: — Uzbekistan, Hissar Range, Sangardak River basin ( Fig. 5a, b ).

Habitats: —The species grows on shallow gravel slopes among Prangos pabularia , at elevations of about 2000 m.

Figures

FIGURE 1. Elwendia bucharica holotype (MW 0595669).

FIGURE 3. General views of mericarps of A. E. bucharica (immature fruit). B. E. ugamica. C. E. capusii.

FIGURE 4. Mericarps cross sections A. E. bucharica (immature fruit). B. E. ugamica. C. E. capusii. 1—exocarp, 2—endosperm, 3— mesocarp, 4—secretory ducts, 5—vascular bundles.

FIGURE 5. A. Distribution of Elwendia bucharica (dots) and E. ugamica (square). B. Detailed distribution of E. bucharica (dots).