Ipomoea lindheimeri Gray

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

243. Ipomoea lindheimeri Gray , Syn. Fl. N. Amer. 2(1): 210. 1878. (Gray 1878: 210)

Ipomoea heterophylla sensu Torrey, Rep U.S. Mex. Bound. Bot. 2(1): 149. 1859. (Torrey 1859: 149).

Ipomoea heterophylla var. aemula House , Ann. New York. Acad. Sci. 18: 196. 1908. (House 1908b: 196). Type. MEXICO. Chihuahua, C.G. Pringle 1339 (holotype GH; not seen, isotypes F, K, NDG, MEXU, NY, US).

Type.

UNITED STATES. Texas, New Braunfels, Lindheimer 622 (lectotype GH00054462, designated here).

Description.

Trailing or twining herb, stem adpressed pilose from a tuberous rootstock. Leaves petiolate, 2-3.5 × 2-3.5 cm, palmately 3-5(-7)-lobed to just over half way, base cordate, lobes elliptic, acute or obtuse, narrowed at both ends, thinly adpressed pilose on both surfaces; petioles 1-3.2 cm, pilose. Inflorescence of solitary, axillary flowers; peduncles 1.5-8 cm, thinly pubescent; bracteoles 3-8 mm, linear, relatively persistent; pedicels 2-15 mm, densely pubescent to densely pilose; sepals subequal, 17-23(-32) × 4-6 mm, broadly lanceolate, finely acuminate, outer pubescent, inner scarious and glabrous except pubescent midvein and ciliate margin; corolla 7-9 mm long, narrowly funnel-shaped, pink with white tube, glabrous, midpetaline bands terminating in distinct teeth. Capsule and seeds not seen.

Illustration.

Figure 126 .

Distribution.

Uncommon in semi-desert areas of the eastern United States-Mexico border areas.

MEXICO. Chihuahua: 5 km N of San Miguel, M.C. Johnston et al. 8968 (MEXU). Coahuila: Puerto Santa Ana, F.L. Lyle Wynd & C.H. Mueller 238 (MEXU, S); Cañon de la Barrica, T. Wendt & E. Lott 1383 (ARIZ, ASU). Nuevo León: Parque de Chepinque, D. Seigler et al. 13395 (MEXU).

UNITED STATES. Arizona: fide Austin (1991a). New Mexico: C. Wright 1613 (BM, K, P, US); Florida Mts., R.D. Worthington 19766 (DES). Texas-New Mexico borders: C. Wright 508 (BM, K, OXF, US); D.E. Atha & M. Greener 11731 (NY); J. Reverchon 654 (P). Texas: G.L. Fisher 50066 (S); Mount Emory Mts., B. H. Warnock 158 (K); Brewster Co., W. Hodgson & A.D. Zimmerman 3658 (DES).

Note.

This species is characterised by its long-pilose, linear sepals and palmately lobed leaves combined with the solitary, narrowly funnel-shaped flowers. Var. aemula has rather broader based sepals and approaches those of Ipomoea lindheimeri var. subintegra . It is possible that this variety represents a hybrid between I. pubescens and I. lindheimeri .

Figures

Figure 126. Ipomoea lindheimeri. A habit B leaf C leaf apex, abaxial surface D outer sepal E inner sepal. Drawn by Rosemary Wise from Wright 1613.