Monographs Details: Cassia caracensis Taub. ex H.S.Irwin & Barneby
Authors:Howard S. Irwin, Rupert C. Barneby
Authority: Irwin, Howard S. & Barneby, Rupert C. 1978. Monographic studies in Cassia (Leguminosae, Caesalpinioideae). III. Sections Absus and Grimaldia. Mem. New York Bot. Gard. 30: 1-300.
Description:Latin Diagnosis - Cassia caracensis Taubert ex Irwin & Barneby, sp. nov., foliis strictim erectis petiolatis 2-foliolatis, foliolisque verticalibus oblanceolatis resinoso-punctatis C. semaphorae manifeste similis, sed ab ea praeter superiorem foliorum faciem fere omnium partium pube parca villosula, stipulis 2-3 (nec < 0.5) mm longis, petiolis anguste sulcatis (nec de latere dilatatis), foliolis penninerviis nec utrinque reticulatis ipso basi in pulvinulum symmetrice attenuatis (nec de latere proximo abrupte cordatulis), pedicellisque brevioribus ± 1.5 (nec 2-3) cm longis certe distincta.
Species Description - Shrubs of unknown habit and stature, the angular summit of stem or branchlets densely clothed in upswept, forwardly imbricate, 2-foliolate lvs, except for lower face of lfts finely villosulous with forwardly incurved hairs but nowhere setulose, the foliage glutinously sublustrous, the lfts on both sides densely resin-dotted, slightly paler beneath, the subcorymbosely few-fld racemes solitary, terminal, scarcely exserted.
Stipules erect, narrowly subulate, 1.5-2.5 mm, persistent at least through life of lf.
Lvs erect petiolate ± 4-5 cm; pulvinus slightly dilated, 1-1.5 mm; petiole ±7-9 mm, at middle 0.6 mm diam, narrowly sulcate, ventrally ciliolate; lfts 1 pair, vertically ascending from tip of petiole, turned half face to face on narrowly ellipsoid, when dry wrinkled pulvinule 1.2-2 mm, in outline oblanceolate, obtuse or emarginate but mucronulate, 2.7-3.7 x 0.8-1.1 cm, at base sub- symmetrically attenuate downward into the pulvinule, the margin entire or minutely undulate, plane or subrevolute, the blade chartaceous, on both sides brownish-olivaceous but slightly paler beneath, above minutely villosulous, beneath glabrous, on both sides densely resin-dotted, the midrib canaliculate above, cariniform beneath, the 6-9 pairs of major secondary veins faintly raised both sides, the tertiary venulation faint and irregular.
Racemes (little known) subumbellately few-fld, the axis less than 2 cm, the ±2 simultaneously expanded fls raised beyond level of buds; pedicels ascending ±1.5 cm, bracteolate 1.5-5 mm below calyx; bracteoles narrowly subulate ±2.5 mm; buds ovoid-acuminate, glutinous, subglabrous; sepals ovate-acuminate, 8-9 x 4-5 mm; petals yellow, the four plane ones subequal, obovate-cuneate ± 11.5 x 8 mm, the fifth petal and androecium not seen; ovary glutinously verruculose and along the ventral suture sparsely yellow-villosulous, not setose. — Collection: 1.
Distribution and Ecology - Habit not recorded, but to be expected around outcrops or in rock-ledges near 1000 m, Known only from Sa. de Caraça on the e. slope of Sa. do Espinhaço at 20° 07' S. — Fl. III-IV.
BRAZIL. Minas Gerais: Serra de Caraça, III.1892 (fl), Ule 2484.
The type specimen of C. caracensis is a branchlet from what we suppose to have been a bushy shrub resembling C. andromedea in habit, briefly described by Ule as strauch, but with no indication of stature. lf our surmise is correct, the species must certainly be related to C. semaphora, native slightly further northward in Serra do Espinhaço in lat. 18° 30'—19° 20' S. While this is similar to C. caracensis in the erect, short-petioled, bifoliolate leaves, it differs in a number of characters, each of them small, but substantial in combination: suppression of all villosulous vesture < other than a minute cioliolation of some leaflets; greatly reduced stipules; broadly winged, openly shallow-sulcate petiole; leaflets elaborately reticulate on both faces and at very base abruptly contracted on the broader side, not symmetrically tapering into the pulvinule; longer pedicels; and corasely hispid pod. The leaflets of C. semaphora are concolorous and not at all dorsoventrally differentiated, wheras those of C. caracensis, apparently of rather thinner texture, have the midrib impressed on the upper and cariniform on the lower face and blades distinctly paler beneath than above. In form and attitude of the leaves and individual leaflets C. caracensis closely resembles the distantly allopatric C. lavradioides, which is, however, a subshrub of modest size with essentially simple stems arising yearly from a xylopodium, furthermore glabrous throughout and with widely sulcate petioles only 2-5.5 mm long.
Minas Gerais Brazil South America
| Brazil South America