An Illustrated Key to Iberian Peninsula Species of Oxalis (Oxalidaceae)

 Óscar Sánchez Pedraja [May 2008 "onwards" (last updated 14 Oct. 2014)]

Oxalis purpurea L. (1753) [Type-NHM]

Oxalis pes-caprae L. (1753)

Oxalis debilis Kunth (1822)

Oxalis latifolia Kunth (1822) [Type]

 

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  Key to Oxalis [Iberian Peninsula]

  Key to Oxalis, Sect. Ionoxalis [Iberian Peninsula]

  References

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Key to Oxalis [Iberian Peninsula]

1.    Caulescent plants (well developed aerial stem). Leaves ± alternate, false-whorls, almost opposite or fasciculate, scattered over entire stem........................................  2.

--    Acaulescent plants (without an aerial stem or apparently so [very short aerial stem at soil level]). Leaves in basal rosette, at soil level or nearly so........................................  3.

2.    Plants with oxalate deposits on leaves, bracts and calyx. Stems arising from a tunicate bulb, which also carry bulbils on the leaf axils. Flowers solitary; petals white or pale pink-purple........................................  Oxalis incarnata [Sect. Oppositae] [see P 05488112, P 05525106, P 05550614, NSW401974, accessed Oct. 2014)]

--    Plants without oxalate deposits. Stems without tunicate bulb and bulbils on the leaf axils. Flowers in umbelliform cymes (rarely solitary); petals always yellow........................................  4.

3.    Petals yellow; rhizomatose and bulbous plant (tunicate bulbs); flowers in umbelliform cyme........................................  Oxalis pes-caprae and f. pleniflora [Sect. Caprinae] (see sub O. cernua in N.J. Jacquin, Oxalis 89: t. 6. 1794); (see Oxalis pes-caprae  in The Linnaean Plant Name Typification Project, accessed 16 May 2008); [see LINN 600.13 Oxalis pes-caprae (Herb Linn) and LINN 600.15 Oxalis cernua (Herb Linn), accessed, Nov. 2008]; (see Oxalis pes-caprae in FloraBase - The Western Australian Flora. Department of Environment and Conservation); (Oxalis pes-caprae  in Aluka, accessed June 2008); (Oxalis pes-caprae in Herbari Virtual del Mediterrani Occidental, accessed May 2008)]

--    Petals white, pink, violet or purple; rhizomatose and/or bulbous plant (tunicate or scaly bulbs); flowers in umbelliform cyme or solitary........................................  5.

4.    Stems procumbent to decumbent (very rarely erect), rooting frequently at almost all nodes or only inferiores. Aerial stems ± hairy; hairs simple, unicellular, not septate (very rarely with some multicellular and septate), curled, ± patent, antrorse or retrorse, (sometimes towards stem apex, ± appressed and antrosos). Leaves ± alternate; stipules conspicuous, rectangular, auriculate and free apex. Seeds brown, transversely ridged and without (or rarely) white markings on ridges........................................  Oxalis corniculata and var. atropurpurea [Sect. Corniculatae] (see Oxalis corniculata in The Linnaean Plant Name Typification Project, accessed 16 May 2008); (see Lectotype: LINN 600.31 Oxalis corniculata (Herb Linn) —cf. G. Eiten in Taxon 4: 101 (1955)—]); (see Oxalis corniculata in Linnean herbarium (S-LINN), accessed 16 May 2008); (see Oxalis corniculata [MO 5346260] in Tropicos.org. Missouri Botanical Garden, accessed 20 June 2008)

--    Stems erect or ± decumbent, not or very rarely rooting. Aerial stems generally densely pubescent, hairs all simple, unicellular, non-septate, antrosos and appressed. Leaves opposite or fasciculate, sometimes ± alternate; stipules inconspicuous, narrowly rectangular, not auriculate and adnate to petiole. Seeds brown, transversely ridged and with conspicuous white markings on ridges........................................  2. Oxalis dillenii [Sect. Corniculatae] [P 05488923, accessed Oct. 2014)]

5.    Flowers solitary........................................  6.

--    Flowers in umbelliform cyme........................................  7.

6.    Rhizomatose plant (slender and scaly rhizome) without bulbs; petals 6-16 mm, white (rarely pale pink to pink petals); leaflets obcordate and emarginate (acute to obtuse sinus) and without translucent spots or dashes (blackish when dry) on its surface........................................  Oxalis acetosella [Sect. Acetosellae] (lectotype: LINN 600.7 Oxalis acetosella (Herb Linn)7 Oxalis acetosella (Herb Linn), accessed, 24 Nov. 2008); (see Oxalis acetosella in The Linnaean Plant Name Typification Project, accessed 16 May 2008); (see Oxalis acetosella in Linnean herbarium (S-LINN), accessed 16 May 2008); [see Oxalis acetosella in O. W. Thomé,  Fl. Deutschland... : 321 (1885)]

--    Bulbous plant with tunicate bulbs; petals (17)24-35 mm, purple (violet, pink, yellow, white, etc. in cultivated forms and its native country); leaflets ± rhombic with obtuse, entire or slightly emarginate apex and with translucent spots or dashes (blackish when dry) over entire surface........................................  Oxalis purpurea [sect. Stictophyllae] (see Oxalis purpurea [BM 000628563, Type] in The Linnaean Plant Name Typification Project, accessed 16 May 2008); (see Oxalis purpurea [Type - Kew negative 600.9 LINN —cf. Savage, Cat. Linn. Herb. 1945—], see LINN 600.9 Oxalis purpurea (Herb Linn), accessed, 24 Nov. 2008]; (see O. purpurea in Aluka, accessed 16 May 2008); (see Oxalis purpurea  —on the sheet, only the little specimen with solitary flowers, the rest is Oxalis bowiei— in National Herbarium of New South Wales-PlantNET, accessed 16 May 2008)

7.    Bulbous plant (tunicate bulbs) with glandular hairs or rhizomatose plant with non-glandular hairs........................................  8.

--    Bulbous plant (scaly bulbs) without glandular hairs.......................................  9.

8.    Plant with glandular hairs. Bulbous plant (tunicate bulbs). Leaflets 24.2-80 × 25-83 mm, ± glabrous on the upper surface but with glandular hairs on lower surface (on nerves and towards the margin) and without oxalate deposits (calli). Pedicel with glandular hairs. Sepal with glandular hairs and without oxalate deposits (calli).  Petals 16-24(30) mm, glabrous..............................   Oxalis bowiei [sect. Caprinae] [(sub O. bowiei Herb. ex Lindl. (1833) [type - plate 1585] in Botanicus - Missouri Botanical Garden, accessed 18 Nov. 2008); (O. bowiei in Ecology & Evolutionary Biology Greenhouses, accessed 16 May 2008); (O. bowiei in Aluka, accessed 16 May 2008); (O. bowiei —sub O. articulata— in Herbari Virtual del Mediterrani Occidental, accessed 16 May 2008)]

--    Plant with non-glandular hairs. Rhizomatose plant [± thick, scaly —old leaf bases—, blackish-brown, woody branching or non-branching rhizome]. Leaflets 12,5-41 × 18-55 mm, ± densely appressed-pubescent on both sides and with ± abundant orange oxalate deposits (calli). Pedicel ± densely appressed-pubescent. Sepal ± densely appressed-pubescent and with 1-2 oxalate deposits (calli) at the tip. Petals (7)12-19 mm, with white hairy bands outside and with some oxalate deposits..............................  Oxalis articulata [sect. Articulatae] (O. articulata in National Herbarium of New South Wales-PlantNET, accessed 16 May 2008)]

9.    Leaves with 4 leaflets (rarely 3 on juvenile plants). Leaflets ± obtriangular (± equal in length and width) and often showing a purple band on upper surface (about proximal half). Cultivated.......................................  Oxalis tetraphylla  [Type] [Sect. Ionoxalis (Iberian Peninsula)]

--    Leaves with 3 leaflets. Leaflets obcordate, obdeltoid or fishtail-shaped (± equal in length and width or more frequently wider than long) and rarely showing a purple band on upper surface (only O. vallicola). Weeds.......................................  10.

10.     Bulb scales with 3 nerves (exceptionally with 5 nerves) in ripe bulbs; bulblets sessile. Leaflets ± broadly obcordate and with oxalate deposits on the submarginal lowerside and sometimes in the rest of the lamina too. Inflorescence is a simple or compound umbelliform cyme; bracts and bracteoles usually with oxalate deposits.......................................  Oxalis debilis [hb. Sánchez Pedraja 09528, bulb] [Sect. Ionoxalis (Iberian Peninsula)]

--    Bulb scales with 3 or more nerves in ripe bulbs; bulblets on ± long rhizomes or sessile; Leaflets ±  broadly obcordate to obdeltoid and without oxalate deposits or rarely 1-2 at sinus). Inflorescence is always a simple umbelliform cyme; bracts and bracteols without oxalate deposits.......................................  11.

11.    Bulb up to 2.8(3.2) cm; bulblets sessile. Leaflets ± broadly obcordate to obdeltoid, with rounded lobes, without oxalate deposits and often showing a purple band on upper surface (about distal half). Homostylous flower (semi-homostylous) with white or very pale pink petals and hairy styles.......................................  Oxalis vallicola [Sect. Ionoxalis (Iberian Peninsula)]

--    Bulb up to 1.5(2) cm; bulblets on ± long rhizomes. Leaflets ± broadly obdeltoid to fishtail-shaped, with ± subacute lobes, without oxalate deposits or only 1-2 at sinus and without a purple band. Tristylous flower (short-styled flower exceptionally long-styled flower) with ± deep pink petals and glabrous styles (hairy styles in long-styled flower).......................................  Oxalis latifolia [Type] [hb. Sánchez Pedraja 12603, flower] [ Sect. Ionoxalis (Iberian Peninsula)]

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