An Illustrated Key to Iberian Peninsula Species of the Section Ionoxalis (Oxalis, Oxalidaceae)

Sect. Ionoxalis (Small) R. Knuth [in Bot. Jahrb. Syst. 50 (Suppl.): 224 (1914)]

Ionoxalis Small [Fl. S.E. U.S.: 665, 1332 (1903), basionym]

 Óscar Sánchez Pedraja [March 2008 "onwards" (last updated 24 June 2008)]

Oxalis debilis Kunth (1822)

Oxalis vallicola (Rose) R. Knuth (1919)

Oxalis latifolia Kunth (1822) [Type]

Oxalis tetraphylla Cav. (1795) [Type]

 

 

 

 

a1, leaf (leaflets 3,  ± broadly obcordate with rounded lobes and with oxalate deposits on the submarginal lowerside and sometimes in the rest of the lamina too)

b1, leaf (leaflets 3, ± broadly obcordate to obdeltoid, with rounded lobes, without oxalate deposits and often showing a purple band on upper surface)

c1, leaf (leaflets 3, ± broadly obdeltoid to fishtail-shaped, with ± subacute lobes, without oxalate deposits or only two at sinus)

d1, leaf (leaflets 4, ± obtriangular (± equal in length and width) and often showing a purple band on upper surface)

a2, inflorescence (simple or compound umbellate cyme)

b2, inflorescence (always simple umbellate cyme)

c2, inflorescence (always simple umbellate cyme)

d2, inflorescence (always simple umbellate cyme)

a3, homostylous flower (semi-homostylous) with pink to pale pink coloured petals

b3, homostylous flower (semi-homostylous), with white or very pale pink petals

c3, tristylous flower (short-styled flower) with ± deep pink petals

d3, tristylous flower (long-styled flower) with pink to red coloured petals

Oxalis debilis Kunth (1822)

Oxalis vallicola (Rose) R. Knuth (1919)

Oxalis latifolia Kunth (1822) [Type]

Oxalis tetraphylla Cav. (1795) [Type]

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  Key to Oxalis (Oxalidaceae) [Iberian Peninsula]

  Key to Oxalis, Sect. Ionoxalis [Iberian Peninsula]

  Similar taxa [commonly mistaken for above (Ionoxalis)]

  Taxa of other sections confused with the taxa of this section (Ionoxalis)

Key to Oxalis, Sect. Ionoxalis [Iberian Peninsula]

1.    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]

--    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.......................................  2.

2.     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]

--    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.......................................  3.

3.    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

--    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]

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Similar taxa [commonly mistaken for above (Ionoxalis)].

A.    Leaflets 3, ± broadly obcordate to obdeltoid, with rounded lobes, without oxalate deposits and often showing a purple band on upper surface (about distal half). Bracts without oxalate deposits. Homostylous flower (semi-homostylous) with white or very pale pink petals and hairy styles..............................  Oxalis vallicola

--    Leaflets 3, ± broadly obdeltoid, with rounded lobes, without oxalate deposits and without a purple band. Bracts without oxalate deposits. Tristylous flower (short-styled flower) with ± pale pink petals and glabrous styles..............................  Oxalis latifolia "from Corwall" sensu Young (1958)

--    Leaflets 3, ± obtriangular, with obtuse lobes and showing a purple band on upper surface (about proximal half). Bracts with oxalate deposits. Tristylous flower (short-styled flower) with pink petals and glabrous styles..............................  Oxalis tetraphylla aff. (O. bulbifera auct. nonn. brit.; O. drummondii auct. nonn. brit.)

 

B.    Bulb scales with 5-9(11) nerves in ripe bulbs; bulblets usually formed, abundant and sessile. Homostylous flower (semi-homostylous); petals c. (8)9-13(14) mm, white or very pale pink.......................................  Oxalis vallicola

--    Bulb scales with 3 nerves in ripe bulbs; bulblets seldom formed and scarce. Distylous flower; petals c. (7)10-20(24) mm, ± pink .......................................  Oxalis jacquiniana Kunth [www.tropicos.org, accessed 21 April 2008]

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Taxa of other sections confused with the taxa of this section (Ionoxalis).

A.    Plant with non-glandular hairs. Bulbous plant (scaly bulbs). Leaflets 17-43(52) × 15-64(75) mm, glabrous or ± sparsely hairy and with or without orange oxalate deposits (calli). Pedicel glabrous or ± sparsely hairy. Sepal glabrous or with a few hairs and with 1-2 oxalate deposits (calli) at the tip. Petals 9-18 mm, glabrous or subglabrous..............................  Oxalis sect. Ionoxalis [Iberian Peninsula]

--    Plant with glandular hairs. Bulbous plant (tunicate bulbs). Leaflets 24.2-80 × 25-83 mm, ± glabrous on 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] [(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)]

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