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(Last Modified On 9/19/2013)
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(Last Modified On 9/19/2013)
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Species
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Oxalis articulata Savigny
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PlaceOfPublication
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Lamarck, Encycl. 4. 686-687. 1797.
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Note
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TYPE: Uruguay, Montevideo, in pascuis, Commerson May 1767 (P-Juss., holotype; P, isotype).
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Description
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Apparently stemless herb to 40 cm; stem ligneous, rhizomatous, brown, dark, more than 15 cm long, to 2 cm diam., tortuose, bearing the scars of the bases of stipules adnate to petioles of decayed leaves; roots tuberous, subligneous, cylin- dric, knobby or articulate, dark, thick, more than 10 cm long, 25 mm diam., branched, fibrous, to 15 cm long, sometimes with a long branch bearing a tuber at its apex. Leaves 3-30-fasciculate; leaflets widely obovate subcuneate or cu- neate, 5-30 mm long, 7-45 mm wide, slightly retuse or acute, incised to 1/5 Of its length, a purplish basal callus frequently present, the pubescence straight, ap- pressed, uniform, dense on both faces or only below, or shorter and loose; orange calli abundant near the margins, unequal, rarely scattered on the rest of the surface; stipules connate to the petiole, ovate or triangular, 4-16 mm long, 2-6.5 mm wide, narrowed towards the apex, the hairs appressed ascendent, ciliate; petioles ascendent, 13-30 cm long, densely appressed pubescent to glabrate with short appressed hairs; petiolule ca. 1/2 mm long, thick, densely pilose. Inflores- cences of umbelliform simple cymes, 2-5-flowered, bifid, asymmetric, multiflow- ered with up to 20 flowers or of bifid cymes composed of umbelliform cymes; peduncles taller than the foliage (2.5-40 cm) the pubescence similar to that of the petioles; bracts 2-3 mm long; bracteole 0.5-1(-2) mm long, situated at the base of the inflorescence, oblong or linear, appressed-pilose with 1-2 orange calli at the apex; pedicels long filiform, 1-5.5 cm long, articulate near the base. Flowers with the sepals linear-elliptic to linear 2.5-6.5 mm long, 1-2 mm wide, acute, the internal sepal obtuse, often with 3-4 unequal calli, densely appressed-pubescent,
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Habit
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herb
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Description
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the hairs straight; petals violaceous, obovate-oblong, clawed, connate near the middle, 2-3 times the length of the sepals, the areas exposed in bud covered with white sericeous appressed hairs; stamens with linear filaments, basally broad and abruptly narrowed about the middle, the longer stamens 3.5 mm long, pubescent, the shorter stamens 2 mm long, glabrous, connate to about 2/3, the anthers ovoid; pistils macro-, meso- and microstylous, ca. 5.5 mm long, the ovary pilose at least at the apex and back of the carpels, carpels 4-8-ovuled, the styles densely pilose, the stigma small, capitate. Capsule cylindric or oblong, acute, 8-11 mm long, the calyx to ?2 of its length, densely ascending appressed pubescent overall or only at the apex of the carpels, the carpels 4-8-seeded; seeds light brownish, ovoid or ellipsoid, acute at both ends, 1-1.25 mm long, 8-9-ribbed in zig-zag, transversally striate with 4-8 deep pits.
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Distribution
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Originally from Uruguay, extreme southern Brazil, and some localities of Buenos Aires (Argentina), this species is introduced and cultivated in other American countries and in the Old World.
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Note
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It may escape and become naturalized.
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Specimen
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CHIRIQUT: Bambito, escaped from cultivation, roadside, Croat 15882 (MO).
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