Aristolochia lassa I.M. Johnst.
Descripción
Geophytic herb, procumbent and climbing, perennial subterranean organs 20-40; stems with 1-2 subterranean internodes, swollen nodes, 10-12 mm long; aerial internodes, 1.5- 2 cm long, sparsely covered with septate trichomes. Petioles terete, (0.1-)0.8-1.3 x 0.05-0.2 cm, green, sometimes purple-pink, sparsely covered with septate trichomes. Leaf blades hastate to trilobed, discolorous, base auriculiform, apex acute, (0.5-)1.3-5.3 x (0.5-)1.3-4.0 cm; palmatinerved, actinodromous, basal veins purplish red, margin entire; adaxial leaf side green, glabrescent with some uncinate septate trichomes; abaxial leaf side pale green, veins pale yellow with sparce septate trichomes, especially along the veins. Flowers axillary, peduncle 0.4-0.7 x 0.01- 0.02 mm, with sparse septate trichomes. Bract deltate to widely ovate, 0.4-0.7 x 0.2-0.5 cm. Perianth geniculate, 1.5-2 cm long, yellow, becoming maroon toward the limb, veins brown-orange, with dense septate trichomes along the veins; utricle obovoid to elliptic, 0.4- 0.5 x (0.2-)0.3-0.5 cm, internal surface yellow with purplish red dots at the base covered with mucilaginous trichomes; tube bent 70°-90° basally widened, 0.7-0.8 x 0.2-0.3 mm, internal surface with purplish red villose trichomes; limb widely ovate, cordate at the base, obtuse to acuminate at the apex, (0.4-)0.5-1.2 x (0.3-)0.5-0.7 cm, maroon glabrous at the lower part becoming yellow-orange toward the limb with purplish red villous trichomes, in lateral view flat; throat elliptic to ovoid yellow-white, minutely granular and glabrous, covered pusplish red villous trichomes; syrinx infundibuliform, eccentric, 1.5 mm long, 1.5 mm wide at base and 1 mm wide at apex. Gynostemium coroniform, stipitate 1.5-2 x 1.5-2 mm; stipe, 0.1 mm long, stigmatic lobes 5, 0.05-1 mm long, anthers 5, 1 mm long. Ovary inferior, oblanceolate, 0.5-0.6 x 0.1-0.2 mm, with dense septate trichomes. Fruit obovoid to spheroid, 1.5 x 1.6 cm, young fruit not seen, brown-orange when mature, with septicidal dehiscence at the apex. Seeds deltoid, 4 x 3.5 mm, upper part black, lower part yellow- brown, with granular surface.A
Fructificación
MayA
Floración
SepA
Ejemplar revisado
MEXICO. Coahuila: Mun. Saltillo, In the Botanical Garden of “Universidad Agraria Antonio Narro“, 25°21´24.7″ N, 101° 01´56.7″ W, 1769 m, 2 Sept 2014, A. Paizanni Guillén et al. 261 (ANSM, IBUG, IEB, DR, MEXU). Nuevo León: Mun. Arramberri, Ascención->Sandia, 1900 m, 9 May 1992, G.S. Hinton 21939 (GHB); 14 km aprox. del poblado La Sandía rumbo a La Ascención, 24°18´52.5″ N, 99°57´46.3″ W, 2026 m, 9 Sept 2014, A. Paizanni Guillén et al. 267 (ANSM, IBUG, IEB, DR, MEXU).A
Elevación
1769 – 2026 mA
Ecología y Hábitat
Aristolochia lassa is distributed in the state of Coahuila in the municipalities of Coahuila and Nuevo León. It grows in grass lands or in open secondary vegetation.A
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
Aristolochia lassa is characterized by its widely ovate limb, maroon glabrous at the lower part, becoming yellow-orange toward the limb with purplish red villous trichomes and the elliptic throat which isyellow with villous purplish red trichomes. The leaf shape is similar to A. versabilifolia, but the latter one occurs in Querétaro, Guanajuato and San Luis Potosí; the limb is lanceolate, maroon and around the throat yellow with purplish red dots. Furthermore, it is closely related to A. karwinskii but this species has larger deltoid leaves and the perianth is longer, reaching up to 8 cmA