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(Last Modified On 11/15/2012)
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(Last Modified On 11/15/2012)
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Species
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MIMOSA ALBIDA Humb. & Bonpl. ex Willd.
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PlaceOfPublication
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Sp. P1. 4:1030. 1806.
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Synonym
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Mimosa strigosa Willd. Sp. P1. 4:1030. 1806, fide Britt. & Rose. Mimosa floribunda Willd. loc. cit. 1031. 1806, not Vent., fide Britt. & Rose. Mimosa Willdenowii Poir. in Lam. Encycl. Meth. Suppl. 1:50. 1810. Mimosa racemosa Schlecht. in Linnaea 12:557. 1838, fide Britt. & Rose. Mimosa albida var. floribunda B. L. Robins. in Proc. Am. Acad. 33:311. 1898, fide Britt. & Rose. Mimosa albida var. strigosa B. L. Robins. loc. cit., fide Britt. & Rose. Mimosa albida var. euryphylla B. L. Robins. loc. cit., fide Britt. & Rose. Mimosa albida var. glabrior B. L. Robins. loc. cit., fide Britt. & Rose. Mimosa Wiltiansii Standl. in Contr. U. S. Nat. Herb. 18:105. 1916, not Rusby. Mimosa Standleyi Macbride, in Contr. Gray Herb. 59:12. 1919.
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Description
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Usually a slender vine with trailing or clambering stems; branchlets terete, glabrous or more commonly (Panama) strigose or lightly tomentose, unarmed or sparingly aculeate (Panama). Leaves moderate, bipinnate, the pinnae a single pair, the leaflets only 2 pairs per pinna; petiole up to 5 or 6 cm. long, eglandular, pubescent like the branchlets, sometimes aculeate, apiculate terminally; pinnular axis 1-2 cm. long, appendaged above the pulvinus, usually pubescent; leaflets usually asymmetrically oblong or elliptic, broadly acute or obtuse and briefly mucronate apically, obliquely rounded basally, the costa strongly excentric, stri- gose-pubescent above and more heavily so below; stipules linear to linear-lanceolate, 3-4 mm. long, rigid, erect, pectinate-ciliate. Inflorescence of axillary, pedunculate heads, sometimes few-fasciculate; peduncles mostly 1-2 cm. long; heads ovoid, compact, multiflorate; floral bractlets suiblinear, with subulate tips, scarcely equal- ling the corolla. Flowers small, sessile, whitish; calyx campanulate, minute; corolla funnelform, about 2 mm. long, usually 4-lobed, not striate, usually tomentulose apically in bud; stamens 4 (5?), mostly 4-6 mm. long, glabrous; ovary glabrous or subglabrous. Legume more or less oblong, 1-3 cm. long and usually 6-7 mm. wide, flat, 1- to few-segmented, short-stipitate or subsessile, acute and subulate apically, setose-strigose or setose-spinose marginally.
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Distribution
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Mexico to northern South America.
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Specimen
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COCLE: Penonome, Williams 101.
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Note
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The cited specimen is the type collection for M. Williamsii Standl. (= M. Standleyi). It appears to be another of the aberrant forms commonly found in M. albida, a species known to vary extravagantly. Standley himself, with the original description of AM. Williamsii, stated his species to be closely related to M. albida. Bentham (Trans. Linn. Soc. 30:390. 1875) lists Panama as included in the range of M. albida as he interpreted the species. Without any attempt to evaluate B. L. Robinson's subdivision of M. albida into varieties, I have here fol- lowed the 'North American Flora' in pigeon-holing a number of different variants, including M. Williamsii Standley, under the early name of M. albida. Even then it is difficult to find any hard-and-fast difference between this species and M. sensitiva L. of South America. M. albida is of a weedy nature, invading cleared and pastured lands where it often becomes a serious pest in forming nearly impenetrable tangles. Like other members of the group it is at least moderately "sensitive" to contact.
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