Mimosa dicerastes Barneby
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Authors
Rupert C. Barneby
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Authority
Barneby, Rupert C. 1991. Sensitivae Censitae. A description of the genus Mimosa Linnaeus (Mimosaceae) in the New World. Mem. New York Bot. Gard. 65: 1-835.
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Family
Mimosaceae
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Scientific Name
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Type
413. Mimosa dicerastes Barneby, sp. nov., foliorum calycisque paleacei forma cum M. papposa et affinibus bene congruens, sed ab illis omnibus caule ad omnes nodos aculeis duobus infrastipularibus vulnerantibus armato necnon statura arborescenti elata dive
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Synonyms
Mimosa papposa Benth.
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Description
Species Description - Arborescent shrubs with knotty defoliate trunks and branches, the densely foliate homotinous stems armed at all nodes with a pair of spreading, erratically up- or down-curved, subterete stramineous aculei to ±(1.5—)2—5 mm long and near base 0.4-1 mm diam., the homotinous stems, lf-stks and peduncles densely strigose-pilose with slender tapering brownish setae to ± 1.5—2 mm, the firm crowded, subconcolorously gray-olivaceous lfts finely densely puberulent on both faces and some proximal ones in addition dorsally appressed-setulose, the peduncles solitary in axils of coeval or immediately hysteranthous lvs, at early anthesis forming a condensed pseudoraceme hardly longer than wide, but this perhaps longer in fruit. Stipules erect firm linear-attenuate 5-7 x 0.3-0.5 mm, caducous before full expansion of associated lf. Leaf-stalks including hard pulvinus 4-11 mm, indistinctly sulcate; pinnae 1-jug., the rachis of each (3-)3.5-7.5 cm, rounded dorsally, carinate ventrally and shallowly excavate laterally between successive pairs of pulvinules, these to 1-2 mm apart; lfts 34-45- jug., decrescent toward each end of rachis but more gradually so distally, the small unequal first pair less than 1 mm distant from pulvinus (paraphyllidia 0), all in outline narrowly lance-oblong from shallowly semicordate base, acute or abmptly apiculate at apex, straight or obscurely arched forward, those near mid-rachis (4-)5-8.5 x 1-2 mm, 4-5 times as long as wide, veinless on upper face, beneath faintly 3-(4)-nerved from pulvinule, the midrib displaced to divide blade ±1:3, the inner posterior nerve produced almost to blade apex, the outer 1 (-2) shorter. Peduncles 15-25 mm; capitula subglobose, without filaments 6.5-7 mm diam., prior to anthesis moriform, the 4-angulate fl-buds minutely papillate-puberulent at apex; bracts linear-spatulate 1.8-2.3 x 0.3-0.4 mm, glabrous and keeled dorsally, the dilated tip setulose-ciliolate; flowers 4-merous 4-androus, only a few distal ones bisexual, the lower staminate and smaller; calyx paleaceous 1.5-2.3 mm, cleft to within ±0.5 mm of base into four setose-decompound lobes; corollas accrescent upward through capitulum, 2.6-3.4 mm, the tube narrowly funnelform, the reddish, callous-thickened cymbiform lobes 0.75-0.9 x 0.5-0.6 mm; filaments pink, monadelphous through ±1 mm, exserted 5-6 mm; pod unknown.
Distribution and Ecology - In campo rupestre, 1000-1250 m, known only from Chapada dos Veadeiros at points 22-25 km n. and 30 km w. of Alto Paraíso, near 14°S in e.- centr. Goiás, Brazil.—Fl. III-V(-?).
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Discussion
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Distribution
Brazil South America| Goiás Brazil South America|