Ipomoea cristulata Hallier

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

322. Ipomoea cristulata Hallier f., Meded. Rijks-Herb. 46: 20. 1922. (Hallier 1922: 20)

Quamoclit gracilis Hallier f., Bull. Herb. Boiss. 7: 416. 1899. (Hallier 1899c: 416), nom. illeg., non Ipomoea gracilis R.Brown (1810) . Type. MEXICO. E. Bourgeau 1061 (lectotype G00418183, designated here; isolectotypes K, P, S).

Type.

Based on Quamoclit gracilis Hallier f.

Distribution.

Slender annual twining herb; stems glabrous or pilose at the nodes. Leaves petiolate, 1.5-10 × 1-7 cm, ovate, 3-5-lobed or, less commonly, entire, base cordate to subtruncate with rounded auricles, apex acute to acuminate, margin irregularly dentate, abaxially glabrous or pubescent; petioles 2-9 cm. Flowers 3-7 in axillary pedunculate cymes; peduncles 3-10 cm; bracteoles 1-2 mm, lanceolate; pedicels 5-14 mm, becoming reflexed in fruit; sepals unequal, oblong, rounded or truncate, outer c. 3 × 2 mm, often adaxially muricate, the subterminal arista 3-5 mm long, inner sepals 4-6 × 3-3.5 mm, the arista c. 3 mm long; corolla hypocrateriform, 2-2.6 cm long, red or orange-red, glabrous; the limb 1-1.5 cm diam.; stamens exserted. Capsules globose, 7-8 mm long; seeds 3.5-5 mm long, ovoid, blackish, tomentellous.

Illustration.

Figure 155 .

Distribution.

Dry, often semi-desert regions of the United States Southwest and northern and central Mexico. It grows in disturbed bushland and similar habitats up to about 2300 m, but appears to be rare below 1500 m.

MEXICO. Baja California Sur: Sierra de la Giganta, A. Carter 4986 (BM, CAS, MEXU). Chihuahua: E.W. Nelson 6739 (K); Sierra Canelo, Río Mayo, H.S. Gentry 2505 (K, S); Seven Star Mine, C.H.T. Townsend & C.M. Barber 382 (BM, K). Coahuila: D. Flyr 1164b (MO). Durango: C.W. Bollwinkel & R.P. Wunderlin 155 (MO); Vicente Guerrero, S. González 1490 (IEB). Est. México & Dist. Fed.: Churubusco, C.R. Orcutt 4306 (BM); Pedregal, E. Lyonnet 684 (K). Guanajuato: J.N. & J.S. Rose 11512 (US); Laguna de Yuriria, S. Zamudio & H. Diáz 4624 (IEB). Jalisco: Tuxpan, Barnes & Land 320 (K). Michoacán: Morelia, G. Arsène 3477 (MO); ibid., G. Cornejo Tenorio 2340 (IEB); Morelia-Quiroga, J.I. Calzada 8153 (IEB, MEXU). Querétaro: Colón, Santa María del Mexicano, R. Hernández 11783 (IEB). San Luis de Potosí: C.C. Parry & E. Palmer 625 (K). Sinaloa: La Palmito-El Carrizo, J.L. Reveal & N.D. Atwood 3626 (K). Sonora: S.S. White 2670 (S); Yécora, Río Maycoba, A.L. Reina-G 95-456 (ARIZ); Alamos, Eggli et al. 1997 (MEXU).

UNITED STATES. Arizona: Santa Rita Mts., Kearney & Peebles 10563 (K, US): J. Tedford 06-504 (ARIZ); Pima, Rincon Peak, M.A. Baker 16352 (ARIZ); Chiricahua Mts, J.C. Blumer 1808 (K). New Mexico: Lovelace Ranch, F.A. & M.M. Iwen 151 (BM); Organ Mts., G.R. Vasey 344 (BM), E.O. Wooton 629 (K); Grant, Mangus Valley, S. Beckworth 150 (DES). Texas: C. Wright 506 (BM); Presidio, Shafter, A.C. Sanders 4179 (UCR); Trans Pecos Mountains fide Correll and Johnston (1970).

Typifications.

Hallier cited various syntypes following his description of Quamoclit gracilis , all those from Berlin apparently destroyed in 1943 so the Bourgeau specimen at G is here selected as lectotype. It is duplicated at K, P and S.

Notes.

This species is similar to Ipomoea hederifolia and I. rubriflora in its morphology but is generally more slender. From I. hederifolia it is distinguished by the often muricate outer sepals, the inner sepals 4-6 mm long, the corolla tube generally straight, the narrower limb <1.5 cm diam. and the style persistent on the capsule; from I. rubriflora it can be distinguished by the often reflexed fruiting pedicel.

Ipomoea cristulata favours desert conditions and sometimes has stiff, virgate branches as in Eggli et al. 1997 (MEXU).

Figures

Figure 155. Ipomoea cristulata. A habit B outer sepal C inner sepal D corolla opened out to show stamens E ovary and style F fruiting inflorescence G capsules H seeds. Drawn by Rosemary Wise A-F from Palmer 103; G from Blumer 1808; H from Lyonet 108.