Elwendia sect. Elwendia

Kljuykov, Eugene V., Zakharova, Ekaterina A., Degtjareva, Galina V. & Samigullin, Tahir H., 2023, Infrageneric classification of Elwendia (Apiaceae) with a restored species, Phytotaxa 595 (2), pp. 149-168 : 157-158

1. Elwendia sect. Elwendia .

Type:— Elwendia caroides Boissier (1844: 140) .

Description:—Polycarpic herbs; stems solid; leaf rachis and petiolules not refracted; stem leaf sheaths not inflated; upper stem leaves pinnate with straight rachis; umbels corymbose or hemispherical, without involucre; bracteoles present; pedicels during fructification thick; fruits hardly or rarely easily separated into mericarps; dorsal mericarp ribs keeled; marginal mericarp ribs winged or not winged; mericarps with a beak under stylopodia ( Fig. 2A ); styles recurved or erect; commissure broad, exocarp terminates near edges of marginal ribs ( Fig. 3A ); mesocarp in marginal ribs consists of non-lignified parenchyma cells or lignified parenchyma cells with pitted walls; vallecular vittae solitary, 2–3 per furrow or numerous; endosperm on commissural side flat; 2n = 12, 13, 22.

Note:—The delimitation of the section follows the original sectional concept of Kljuykov (1988). The diagnostic feature of this section is a presence of the beak under stylopodia ( Fig. 2A ), which is distinct from other Elwendia species.

Figures

FIGURE 2. Variability in fruit morphology in Elwendia from dorsal (A, C–D) and lateral (B) sides.A, mericarp of E. afghanica with beak. B, fruit of E. caroides with mericarps hardly separating. C, mericarp of E. persica with filiform dorsal and marginal ribs and without beak. D, mericarp of E. setacea with almost obsolete dorsal and marginal ribs and without beak. E, mericarp of E. vaginata with narrow-winged marginal ribs and without beak.

FIGURE 3. Variability in fruit anatomy within Elwendia on schematic transects of mericarps. A, E. caroides with mericarps hardly separating, non-lignified mesocarp parenchyma cells in marginal ribs, solitary small vallecular vittae and flat endosperm on commissural side. B, E. cylindrica with broad mericarp commissure, non-lignified mesocarp parenchyma cells in marginal ribs, solitary vallecular vittae and flat endosperm on commissural side. C, E. latiloba with broad mericarp commissure, lignified mesocarp parenchyma cells with pitted walls in marginal ribs, numerous vallecular vittae and flat endosperm on commissural side. D, E. salsa with intermediate mericarp commissure, non-lignified mesocarp parenchyma cells in marginal ribs, solitary vallecular vittae and flat endosperm on commissural side. E, E. setacea with intermediate mericarp commissure, non-lignified mesocarp parenchyma cells in marginal ribs, large solitary vallecular vittae and endosperm on commissural side with groove. F, E. vaginata with broad mericarp commissure, sclerenchyma cells at marginal ribs, solitary vallecular vittae and flat endosperm on commissural side. 1, exocarp; 2, vallecular vittae; 3, vascular bundle; 4, mesocarp, non-lignified parenchyma cells; 5, sclerenchyma cells; 6, endosperm; 7, commissure; 8, lignified parenchyma cells with pitted walls. Scale bar: 1 mm.