Chamaecrista absus (L.) H.S. Irwin & Barneby, Mem. New York Bot. Gard. 35: 664. 1982; Cassia absus L.; Grimaldia hispidula (L.) Link. Monocarpic herb, 0.2—1 m de alto, erect or trailing; tallos frondosos y pecíolos distales setosos and pilose. Hojas 1.5—9 (11.5) cm de largo; folíolos 2 pares, insertados 3--15 mm entre sí, obovado, rhombic-elíptico, or ovado, los del par distal (5--) 8--46 mm de largo y (3--) 5--28 mm de ancho, rounded, obtuse or acute; pecíolos (7--) 10—50 mm de largo, sin nectarios, rachis with minute ligulate appendages at insertions of petioules, estípulas triangular-subuladas to narrowly lanceolate, hasta 5 mm de largo. Racimos terminales u opuestos, con 8–20 (—40) flores laxas, el eje tornándose (1--) 1.5—13 (--30) cm de largo, con setas glandulares, pedicelos 1.5—4 mm de largo (to 7 mm de largo in fruit); sépalos 3—4.7 mm de largo, obtuse or subacute, con setas; pétalos all equal or 3 adaxial slightly larger, spatulate, the longest 4.3—7.2 mm de largo; estambres 2--7; estilo apically dilated and curved inward. Fruto linear-oblongo, (2.2--) 2.4—5 cm de largo y 5—7 (--8) mm de ancho, valvas generally con setas y sometimes also pilose, straminous or brown. The two varieties of this species known from Central America are separated by number of anthers. The only specimen from Nicaragua is in fruit. It is assumed to be the native variety due to its locality of collection, and overall aspect more like that of the native variety.
Hierba erecta o procumbente, 0.1–1.2 m, usualmente anual, monocárpica, las ramitas rígidas, víscido- pilosas y setosas; estípulas (0.08–)0.12–0.5 cm, angostamente acuminado-deltadas a angostamente lanceoladas. Hojas con el pecíolo (0.7–)1–5 cm, sin nectarios glandulares; folíolos 2 pares, 1–4.5 X 0.8–3 cm, oblongos a obovados, agudos a obtusos en el ápice, glabros o vilósulos en ambas caras. Infls. terminales, hasta ca. 13 cm, de (3–)8–20(–40) fls. Fls. amarillas a anaranjadas o rojo ladrillo, el pedicelo 3–9 mm; sépalos 3–4.7 mm; pétalos más largos 4.3–7.2 mm; estambres 5–7(8). Frs. 2.5–5.5 X 0.6–0.8 cm, linear-oblongos, setosos; semillas negro brillante, oblongo-obovoides, ligera a fuertemente lineolado-foveoladas.
Annual herb, sometimes slightly woody, with erect, sparsely to densely branching (when sometimes ± procumbent due, probably, to browsing or cutting) stems (0.1 -)0.3-0.6(- 1) m high, the whole plant glandular, viscid. Stems terete, faintly ridged, villous to pilose (densely so in young parts, becoming sparser with age), hairs scattered, straight, ± patent, white, glandular-based (apices eventually falling or breaking to leave the sticky bases), usually with more numerous, fine, shorter, ± curved, white hairs intermixed. Leaves variable in size: petiole and rhachis 1-5 cm long; stipules linear-subulate, ±3 mm long, ±0.3 mm wide, with a clearly defined main vein, ± pilose, tardily deciduous; petiole 0.7-4.3 cm long including basal pulvinus; petiolar gland lacking; rhachis with a sessile, ± flattened and bract-like, or slender and finger-like, acute to acuminate, pale gland between each pair of leaflets; leaflets in 2 pairs, obovate, elliptic or sub-orbicular, (0.5-)1-4.7 cm long, 0.5-3.3 cm wide, uppermost pair usually largest, bases asymmetric, apices obtuse, less frequently rounded, usually mucronate, margins slightly thickened, pilose with stiffer glandular-based and shorter soft white hairs intermingled; surfaces glandular (glands sessile, numerous), velutinous to sparsely villous with fine, white, straight, usually patent, sometimes ± appressed hairs. Inflorescences terminating main stems and branches (never axillary), racemes 1-6(-8) cm long, ±10-flowered. Bracts 3-4 mm long, 1-1.5 mm wide, ovate, acuminate, persistent; pedicels at flowering ±3 mm long, at fruiting 5-9 mm long. Sepals obtuse. Petals sub-equal, obovate to ± spathulate, 5-6 mm long, ±2.5 mm wide, yellow, orange, salmon or pinkish-red, veins usually reddish-brown. Stamens 5, all fertile, sub-equal, dehiscence apical at first, without clearly defined pores, becoming longitudinal. Ovaries strigose with dense, bristle-like white hairs; styles slightly curved, dark-coloured, glabrous; stigmas slightly expanded into a ± hooded fan-shaped lobe with finely ciliate margin. Pods oblong-linear, straight to slightly curved, (2.5-)3-5.5 cm long, 0.5-0.8 cm wide, compressed, sutures thickened, pubescent, valves setose to pilose with scattered, rather stiff, glandular-based hairs, with or without fine soft hairs intermixed, dehiscent. Seeds few per pod, laterally flattened, elliptic, subrhombic or suborbicular, 4-5 mm long, 3-4 mm wide, testa dark brown to black, shining, marked with longitudinal rows of lighter dots; areoles acking.
Semi-erect herb, up to 0.6 m high, glandular, viscid. Leaves with 2 pairs of leaflets only. Flowers 5-6 mm long. Pods oblong-linear, 30-555 x 5-8 mm, valves setose to pilose with scattered, rather stiff, glandular-based hairs. Flowers yellow.
Annual erect sticky herb, sometimes woody at the base. Stems terete, lightly ridged, hirsute with hispid and glandular hairs of various lengths. Leaves paripinnate; rachis 3-5.5 cm long; stipules 3-6 x 0.5-1 mm, narrowly triangular, hirsute with glandular hairs; petiolar glands absent; leaflets in 2 pairs, 1.7-4.7 x 1.2-3.2 cm, broadly elliptic to broadly obovate, cuneate on proximal side, rounded on distal, apex rounded to obtuse or broadly acute, mucronulate, base asymmetric, sparsely appressed-pubescent on both surfaces; midrib median; 0-1 lateral nerves from base on proximal side, 1-2 on distal side. Inflorescences terminal, racemose, becoming leaf-opposed through growth of an axillary bud; bracts c. 2.5 x 1.5 mm, ovate, base cordate, apex acuminate; pedicels 0.3-1 cm long, with 1-2 minute bracteoles. Sepals 4.1-6.3 x 1.7-3 mm, glandular-hairy outside. Petals yellow, buff or orange, usually with darker markings, 6.5-8.7 x 3-4 mm, including the 1.5 mm long claw, broadly obovate. Stamens 5-6, subequal. Ovary 4 mm long, densely appressed-hairy; style c. 2 mm long, glabrous; stigma subterminal, oblique. Pods 4-5 x 0.6-0.8 cm, oblong, sparsely glandular-hairy. Seeds black, shiny with scattered surface pitting and brown dots, 5-6.5 x 3.5-5 mm, rhomboid to elliptic in outline, flattened.
In disturbed grassland, or in open patches in forest or parkland. They are also common on stony exposed ground, on roadsides or sites of old cultivations, or they may be riverine, growing on sandy alluvium.
. Disturbed grassland, open patches in forest and roadsides.