Stenodrepanum Harms, Notizbl. Bot. Gart. Berlin-Dahlem 7: 500. 1921.

Bruneau, Anne, de Queiroz, Luciano Paganucci, Ringelberg, Jens J., Borges, Leonardo M., Bortoluzzi, Roseli Lopes da Costa, Brown, Gillian K., Cardoso, Domingos B. O. S., Clark, Ruth P., Conceicao, Adilva de Souza, Cota, Matheus Martins Teixeira, Demeulenaere, Else, de Stefano, Rodrigo Duno, Ebinger, John E., Ferm, Julia, Fonseca-Cortes, Andres, Gagnon, Edeline, Grether, Rosaura, Guerra, Ethiene, Haston, Elspeth, Herendeen, Patrick S., Hernandez, Hector M., Hopkins, Helen C. F., Huamantupa-Chuquimaco, Isau, Hughes, Colin E., Ickert-Bond, Stefanie M., Iganci, Joao, Koenen, Erik J. M., Lewis, Gwilym P., de Lima, Haroldo Cavalcante, de Lima, Alexandre Gibau, Luckow, Melissa, Marazzi, Brigitte, Maslin, Bruce R., Morales, Matias, Morim, Marli Pires, Murphy, Daniel J., O'Donnell, Shawn A., Oliveira, Filipe Gomes, Oliveira, Ana Carla da Silva, Rando, Juliana Gastaldello, Ribeiro, Petala Gomes, Ribeiro, Carolina Lima, Santos, Felipe da Silva, Seigler, David S., da Silva, Guilherme Sousa, Simon, Marcelo F., Soares, Marcos Vinicius Batista & Terra, Vanessa, 2024, Advances in Legume Systematics 14. Classification of Caesalpinioideae. Part 2: Higher-level classification, PhytoKeys 240, pp. 1-552 : 1

Stenodrepanum Harms, Notizbl. Bot. Gart. Berlin-Dahlem 7: 500. 1921.

Fig. 46

Type.

Stenodrepanum bergii Harms

Description.

Suffrutescent shrub, or perennial herb, (10) 20-40 cm, with bud-bearing and occasionally tuber-forming roots; glabrous, with globose sessile glands scattered along the branches. Stipules ovate. Leaves bipinnate, pinnae in 1-3 opposite pairs plus a single terminal pinna; leaflets in 5-9 opposite to subopposite pairs per pinna, embedded glands on the lower surface. Inflorescence a lax, terminal raceme. Flowers bisexual, zygomorphic; hypanthium persistent as a small cup at the apex of the pedicel as the fruit matures; sepals 5, caducous, glandular, the lower cucullate sepal covering the other four in bud; petals 5, free, yellow, the median petal with red markings, stipitate glands on the dorsal surface; stamens 10, free, filaments pubescent and glandular; ovary glandular. Fruit linear to slightly falcate, cylindrical, torulose, 1-5-seeded. Seeds ovoid.

Chromosome number.

2 n = 24, 36 ( Caponio et al. 2012).

Included species and geographic distribution.

Monospecific ( S. bergii ), endemic to central and western Argentina (Fig. 46 ).

Ecology.

Subtropical wooded grassland and scrub, especially close to salt pans.

Etymology.

From Greek, steno - (= narrow) and drepano - (= sickle), in allusion to the narrow sickle-shaped fruit.

Human uses.

Unknown.

Notes.

Morphologically similar in appearance to the genus Hoffmannseggia but with a distinctive linear to slightly falcate, cylindrical, torulose fruit. Resolved as sister to Hoffmannseggia in Gagnon et al. (2016), but not included in the analysis of Ringelberg et al. (2022).

Taxonomic references.

Caponio et al. (2012); Gagnon et al. (2016); Kiesling et al. (1994); Lewis (2005b); Nores et al. (2012); Ulibarri (1978, 1979, 2008).

Figures

Figure 46. Distribution of Stenodrepanum based on quality-controlled digitised herbarium records. See Suppl. material 1 for the source of occurrence data.