Ipomoea barbatisepala var. angustata (Choisy)

Wood, John R. I., Munoz-Rodriguez, Pablo, Williams, Bethany R. M. & Scotland, Robert W., 2020, A foundation monograph of Ipomoea (Convolvulaceae) in the New World, PhytoKeys 143, pp. 1-823 : 1

258b. Ipomoea barbatisepala var. angustata (Choisy) J.R.I. Wood & Scotland, comb. & stat. nov

urn:lsid:ipni.org:names:

Ipomoea angustata Brandegee , Univ. Calif. Publ. Bot. 4 (19): 383. 1913. (Brandegee 1913: 383). Type. MEXICO. Sinaloa, Culiacan, T.S. Brandegee s.n. (holotype UC105148).

Diagnosis. Distinguished by the narrow linear-lanceolate, glabrous sepals.

Distribution of species. Locally common between 200 and 2400 m in the Sonora Desert of Southern Arizona, but uncommon and scattered in other semi desert areas of northern Mexico and the United States southwest.

MEXICO. Baja California Sur: Comondú, A.M. Narvaez 2012-209 (HCIB). Guerrero: J. Calónico Soto 17769 (MEXU). Jalisco: Montes & Salazar 874 (FTG). Michoacán: J. Soto Nuñez 10918 (MEXU). Oaxaca: Santa Maria de Tule, W.G. D’Arcy 11973 (FTG, MO). Sinaloa: El Potrerillos, J.G. Ortega 874 (K). Sonora: Yécora, T.R. Van Devender 97-1016 (ARIZ, MEXU). UNITED STATES. Arizona: Apache Pass, J.G. Lemmon 439 (BM, P); Pima County, J. Tedford 06-255, (ARIZ); W. Hodgson 23418 (DES); Santa Cruz county, W. Hodgson et al. 15772 (DES). New Mexico: Loma County, Tres Hermanas Mts., R.D. Worthington 19947 (DES, FTG); Florida Mountains, R.D. Worthington 18612 (L). Texas: El Paso, Franklin Mountains, R.D. Worthington 14686 (DES).

Note.

Ipomoea barbatisepala appears superficially to be a relative of Ipomoea nil but the capsule is 4-seeded and molecular studies place it close to I. tricolor . The linear-lanceolate sepals with stiff spreading hairs are distinct but these are absent in the type of Ipomoea angustata . This has never been recollected but is superficially very distinct and is recognised as var. angustata .

• Species 259-267 form a small clade but lack any clear common morphological character. The presence of two species with an unusual ovary structure is noteworthy.