Heracleum abyssinicum (Boiss.) C. Norman
  • J. Bot.


Cite taxon page as 'WFO (2020): Heracleum abyssinicum (Boiss.) C. Norman. Published on the Internet;http://www.worldfloraonline.org/taxon/wfo-0001068959. Accessed on: 05 Dec 2020'

Morphology

Fruit obovate to oblong-obovate, 7–12 × 5–8 mm., thinly pilose throughout; stylopodia conical, not exceeding the apical notch of the fruit; styles arcuate-recurved, 1.5–2 mm.; vittae 4 dorsally, 2 on the commissure, all reaching to near the base or the commissural somewhat shorter.

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    Flowers white or creamy, the outermost petals of the outer partial umbels slightly radiate, cordate, 1.5–3 mm.; inner petals oblong-obovate with an incurved tip, ± 1.25 mm.

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    Calyx-teeth narrowly triangular to linear, sometimes persistent in fruit, ± 0.5 mm.

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    Umbels several, on sulcate peduncles 2.5–12 cm. long; rays (4–)6–18, sulcate, densely pilose, 1.5–6 cm.; involucre usually present but sometimes very small, of ± 3–6 narrowly linear or broader bracts mostly ± 3–10 mm. long; partial umbels ± 15–35-flowered, pedicels 3–10 mm., commonly furnished with dense and broad-based tuberculiform hairs and fewer, clearly marked off, longer glandular hairs, sometimes with short tuberculiform hairs only; involucels of 4–9 linear bracteoles 2–7 mm. in length, rarely exceeding the pedicels in young fruit.

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    Basal leaves several, ± narrowly oblong in outline, ± 8–23 × 2–8 cm., simply pinnate with 3–7 pairs of roundish to ovate or broadly deltoid, 1–4.5 × 0.8–5 cm. irregularly incised-dentate to subpinnatifid leaflets, teeth blunt to subacute, mucronate; indumentum ± generally distributed over both surfaces but densest on the veins and margins; sheaths striate, rather narrow, ± 1.5–3 × 0.8–1 cm.; petiole ± 4–11 cm.; median stem leaves shortly petiolate or sessile on the sheaths, leaflets similar or more sharply dentate and/or with narrower segments; sheaths not very broad and inflated, ± 1–2.5 × 0.8–1 cm.; uppermost leaves much reduced, often with a very small lamina; sheaths small, up to ± 2 × 0.8 cm.

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    Perennial, 0.2–1.8(–2.5 when growing in and supported by bushes) m., with fistular, sulcate-striate, densely pilose stems; stems 3–8 mm. wide below, simple or frequently with one or more long, ascending branches from the lower half upwards, branches with much-reduced leaves.

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    Leaves sheathing at the base; petiole approximately 1/3 the total length of the leaf.

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    Leaves up to 30 × 7 cm., simply pinnate, mostly basal, with 3–7 pairs of ovate-deltate leaflets and 1 terminal one.

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    Carpophore deeply 2-cleft.

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    Vittae 1 in each interval and 2 in the commissural face.

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    Stem terete, solid, rather coarsely striate with clearly marked ridges, often purplish especially near the base, covered with numerous short, erect bristly hairs some of which are glandular; the base covered with fibrous remains of old leaf bases.

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    Perennial or biennial herbs with fleshy to woody taproots, up to c. 1 m. tall.

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    Petiole and rhachis with hairs similar to those on the stem; superior surface of the leaflets with scattered, short, fine appressed hairs; inferior surface nearly glabrous with a few hairs on the veins only; margin with a fringe of short spreading hairs.

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    Inflorescence of terminal and lateral compound umbels. Rays 7–14, subequal; bracts 0-several, small, linear and inconspicuous. Partial umbels with 10–20 flowers, mostly hermaphrodite but sometimes with a small group of male flowers at the centre; bracteoles 0-few, similar to the bracts; pedicels relatively robust.

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    Petals white, the outer ones more or less radiate.

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    Fruit c. 9 × 5 mm., obovate, strongly dorsally compressed; calyx teeth obsolete; stylopodium conical with somewhat lobed base; styles 1·5 times as long as the stylopodium, tending to fall in fruit. Fruit wings well developed and forming a notch in which the stylopodium is situated at maturity. Dorsal ridges filiform.

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    Leaflets jaggedly cut and toothed, sometimes nearly reaching the midrib; teeth ending in a short hyaline mucro.

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     Information From

    Apiaceae
    World Flora Online Data. 2017.
    • A CC0 1.0 Universal (CC0 1.0).
    Plants Of the World Online Portal - FZ
    https://www.kew.org/science/who-we-are-and-what-we-do/strategic-outputs-2020/plants-of-the-world-online
    http://www.plantsoftheworldonline.org/terms-and-conditions
    • B
    Plants Of the World Online Portal - FTEA
    https://www.kew.org/science/who-we-are-and-what-we-do/strategic-outputs-2020/plants-of-the-world-online
    http://www.plantsoftheworldonline.org/terms-and-conditions
    • C
    World Flora Online consortium
    http://www.worldfloraonline.org/organisation/WFO
    World Flora Online Data. 2018.
    • D CC0 1.0 Universal (CC0 1.0).