Crassula alba Forssk.
  • Fl. Aegypt.-Arab.


Cite taxon page as 'WFO (2020): Crassula alba Forssk. Published on the Internet;http://www.worldfloraonline.org/taxon/wfo-0000624770. Accessed on: 26 May 2020'

Morphology

Flowers white.

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    Erect herb to 3 ft. high. with stout stem

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    Biennial or perennial rosette herb with tuberous root.

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    Inflorescence a terminal, repeatedly dichotomous, usually rather dense flat-topped corymbose cyme with foliaceous bracts, rarely with axillary inflorescences in the axils of the upper leaves; pedicels up to 15 mm. long, glabrous or nearly so.

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    Rosette leaves usually disappearing by anthesis, linear-lanceolate, lanceolate or oblong-lanceolate, up to 16(–20) cm. long, 0.5–2.5 cm. wide, apex attenuate-acute, bases of opposite leaves united to form a sheath around the stem up to 1(–1.5) cm. long, usually glabrous above, papillose-pubescent becoming glabrescent or glabrous beneath, margins entire, papillose ciliate; cauline leaves similar, blades, sheaths and internodes shortening towards the apex.

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    Stems annual, dying back after flowering, erect, usually simple, up to 60(–90) cm. high, terete, 2–5(–20) mm. in diameter, papillose pubescent, rarely glabrous; papillae retrorse appressed, whitish, elongate or short.

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    Petals white or greenish white or bright to deep red, oblong, (3–)3.5–8 mm. long, (1.2–)1.5–2(–2.5) mm. wide, obtuse to subacute, thickened and mucronate, margins entire, glabrous and minutely papillose-ciliate.

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    Stamen-filaments (2–)2.5–3(–5) mm. long; anthers oblong, 0.5–0.8 mm. long.

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    Flowers 5-merous.

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    Calyx-lobes lanceolate to ovate-lanceolate, 2.5–4(–6.5) mm. long, 1–1.3 mm. wide, acute, margins with few-many ± contiguous papillae (papillae larger than in C. vaginata).

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    Seeds 8–30 per carpel, broadly oblong, ± 0.5 mm. long, ± 0.3 mm. wide, minutely longitudinally rugulose (indistinguishable from those of C. vaginata).

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    Fig. 2A, p. 14.

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    Nectary scales rectangular to almost square, ± 0.5 mm. high, truncate.

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    Carpels oblong, (2.7–)3.5–5.5 mm. long, narrowing into styles about one-quarter the length of the ovaries, indistinctly papillose-ciliate or glabrous along the suture.

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    Filaments (2)2·5-3(3·5) mm. long; anthers (0·5)-0·75(1) mm. long, rectangular.

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    Follicles (2·75)3-5-5·5 mm. long including the styles.

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    Corolla (4·5)5·7 mm. long; petals 1·25-2 mm. broad, oblong, obtuse or subacute, erect but with ± reflexed or spreading tips, mucronate below the slightly inflexed apex, sometimes minutely scabrid outside towards the apex, white, greenish-white flushed with pink or bright to deep red.

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    Scales ± 0·5 mm. long, rectangular or subquadrate, truncate.

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    A perennial or biennial succulent herb up to 90 cm. high with a tuberous root producing one to many flowering stems, surrounded at base by dense rosulate leaves which usually disappear at anthesis.

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    Rosette-leaves up to 16(20) x 2·5 cm., oblong-lanceolate or lanceolate, attenuate towards the acute apex, entire and ciliate or pectinate-ciliate at the margin (the cilia usually nearly contiguous, acute), sessile and connate at the base, flat, fleshy but not very thick, usually glabrous, sometimes papillose-pilose, green, sometimes with purple marks or ± purple beneath, deflexed; cauline leaves similar to the basal ones but usually smaller, the lower longer than the internodes, the upper successively shorter, becoming erect and ± clasping the stem, the upper cauline leaves sometimes ovate-lanceolate or elliptic-oblong, sometimes nearly bract-like; sheaths of lower cauline leaves 0·2-0·8(1·2) cm. long, those of the upper ones very short.

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    Stem ± stout, erect, terete, simple, fleshy, from base to apex ± covered all around with retrose, appressed, whitish, ± long hair-like papillae (or papillae short, obtuse or acute, sometimes nearly bulliform), rarely glabrous, fleshy, green or reddish-purple.

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    Calyx (2·5)3-5·5(6·5) mm. long, usually longer than 5 corolla to equalling it; sepals 1-1·25 mm. broad, lanceolate to linear-lanceolate, very attenuate, ± acute, Sérrulate or denticulate to ciliate-pectinate at the margins (cilia acute, ± rigid), or entire, green or reddish-purple.

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    Flowers 5-merous, arranged in a terminal, ± dense, up to 17(30) cm. in diam., corymbose, flat-topped inflorescence, with papillose or hairy branches; pedicels up to 15 mm. long, glabrous or nearly so.

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     Information From

    Crassulaceae
    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
    Plants Of the World Online Portal - FWTA
    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
    • D The Trustees of the Royal Botanic Gardens, Kew
    World Flora Online consortium
    http://www.worldfloraonline.org/organisation/WFO
    World Flora Online Data. 2018.
    • E CC0 1.0 Universal (CC0 1.0).