Adesmia bonariensis Burkart, Lilloa

Monteiro, Thiago Cobra E, Iganci, João Ricardo Vieira, Miotto, Silvia Teresinha Sfoggia, Simpson, Beryl B., Vatanparast, Mohammad, Lewis, Gwilym P., Klitgård, Bente B., Pezzini, Flávia Fonseca, Vargas, Oscar M. & Fortuna-Perez, Ana Paula, 2024, Towards a Monophyletic Infrageneric Circumscription of Adesmia DC. (Dalbergieae, Leguminosae): a Taxonomic Revision in Adesmia series Adesmia, Phytotaxa 639 (1), pp. 1-69 : 17

2. Adesmia bonariensis Burkart, Lilloa 15: 14 (1949).

Type:— ARGENTINA. Buenos Aires: Tandil, Los Nogales , entre rocas, 21 November 1937, {fl./fr.}, Pastore , A. I. & Troncoso , N. S. s.n. (holotype: SI barcode 001516 [photo!], isotypes: NY barcode NY00759137 [photo!]; SI barcode 001517 [photo!]) .

Prostrate to ascendant subshrubs, adventitious roots from stem branch nodes absent. Stem pilose, with ochraceous glandular setules on all green plant parts. Stipules 4–6× 1.5–2.5 mm, triangular to deltate, pilose on the abaxial surface and margin. Leaves with 4–5 pairs of leaflets; petiole 0.4–1.6 cm long, rachis 0.9–3.3 cm long, pilose; leaflets 2–15× 1– 5 mm, elliptic to obovate, apex retuse, base acute, margin entire, pilose to glabrous. Solitary axillary flowers, rarely a terminal raceme, 4–6 cm long, pilose; bracts 2–3 mm long, lanceolate, pilose; pedicel reflexed after anthesis, 3–25 mm long, pilose. Flowers 6–8 mm long; calyx 4–5 mm long, externally pilose, internally hirsute on the lobes with white tector hairs; lobes 2–2.5 mm long, narrowlY-triangular to triangular; standard petal straight to reflexed, 7–9× 4–5 mm, orbicular, apex obtuse, externallY pubescent, claw 2–3× 1–1.5 mm, internallY pubescent; wing petals 5–6.5× 2–3 mm, oboVate, claw 2–3.5 mm long; keel petals 5–6× 2–3.5 mm, falcate, claw 2–3 mm long; stamens 5–7 mm long, anthers orbicular; gynoecium 5.5–7.5 mm long; ovary 2–3 mm long, pubescent to hirsute, 4–6- ovulate. Hemicraspedium 17–25 mm long, straight, light-brownish, pilose to pubescent, stiff setules in the center of each article, fruit with 4–6 articles, these 3–4× 3.5–4.2 mm, spherical. Seeds dark-brownish, 2–3.3× 2–3 mm, orbicular, without an aril.

Distribution and Habitat— Adesmia bonariensis is only known by the type specimen from Tandil, Buenos Aires, Argentina, and a collection from Minas in Uruguay ( Fig. 5 ). It grows in rocky soils. The type locality of Tandil, in the Pampean biogeographical province, is at the transition zone between the “ Pampeano austral ” and “ Pampeano oriental ” districts ( Arana et al. 2021).

Phenology— The species has been collected with flowers and fruits from October to November.

Conservation status— Data Deficient (DD). With only two known records and locations, it is impossible to calculate an EOO for the species. The AOO, however, was estimated at 8 km ². The data is insufficient to make a conservation assessment for the species, and more collections are needed.

Etymology— The epithet bonariensis refers to the Province of Buenos Aires, in Argentina, where the species was first collected.

Notes— Adesmia bonariensis morphologically resembles A. smithiae DC. and A. securigerifolia Herter , but distinguishes from both by its fruits with spherical articles (vs. discoid articles in A. smithiae and triangular articles in A. securigerifolia ). The species has retuse leaflets, typical of the previously recognised series Subnudae , and was compared with A. securigerifolia (series Subnudae ) in its original diagnosis ( Burkart 1949), but was later placed by Burkart (1967a) and Ulibarri and Burkart (2000) in series Adesmia without explanation. In our phylogeny, it appears closely related to A. securigerifolia .

Additional Specimens Examined — URUGUAY. MINAS: Lavalleja, Ruta 8, October 1959, Kachele s/n (MVFA).

Figures

FIGURE 5. Geographical distribution of Adesmia bicolor (Poir.) DC., A. bonariensis Burkart, and A. cordobensis Burkart.