Ipomoea squamisepala O'Donell

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

363. Ipomoea squamisepala O'Donell , Lilloa 23: 453. 1950. ( O’Donell 1950a: 453)

Ipomoea angulata Mart. ex Choisy in A.P. de Candolle , Prodr. 9: 371. 1845. (Choisy 1845: 371), non Ipomoea angulata Lam. (1791) . Type. BRAZIL. J.B. Pohl 1646 (holotype M0184962, isotype?BR).

Ipomoea angulata var. latifolia Meisn. in Martius et al. , Fl. Brasil. 7: 248. 1869. (Meisner 1869: 248), nom. illeg., autonym.

Ipomoea angulata var. gnidioides Meisn. in Martius et al. , Fl. Brasil. 7: 248. 1869. (Meisner 1869: 248). Type. BRAZIL. [ Goiás], Serra Dourada, J.B. Pohl s.n. (lectotype BR0000005307449, designated here).

Ipomoea squamisepala var. gnidioides (Meisn.) O'Donell , Lilloa 23: 453. 1950. ( O’Donell 1950a: 453).

Ipomoea angulata var. linearis Meisn. in Martius et al. , Fl. Brasil. 7: 248. 1869. (Meisner 1869: 248). Type. BRAZIL. Goiás, L. Riedel [2757] (NY00319142, lectotype designated here; LE01025971 isolectotype).

Type.

Based on Ipomoea angulata Mart. ex Choisy

Description.

Erect undershrub from a xylopodium to c. 1 m, stems very woody, somewhat ridged, glabrous; plant drying blackish. Leaves shortly petiolate, (2-)4-6 × (0.2-)0.5-1.5(-3) cm, linear-oblong, oblong-elliptic or oblanceolate, obtuse to acute and apiculate, cuneate at base, glabrous; petiole 0-5 mm, poorly defined. Inflorescence racemose, terminal, typically elongate to 40 cm, sometimes branched but sometimes much reduced, often dense, formed of shortly pedunculate cymes from the upper leaf axils; peduncles 0-1.5 cm, erect; bracteoles fugacious (not seen); secondary peduncles c. 2 cm, often rhachis-like; pedicels 3-8 mm; sepals very unequal, obovate-elliptic, rigid, glabrous, outer 2-4 × 2 mm long, obtuse, white-margined, inner 5-7 × 3-4 mm, rounded, margins scarious; corolla 2-4 cm long, funnel-shaped, white or lilac, glabrous, limb c. 2.5-3 cm diam. Capsules and seeds not seen.

Illustration.

Figures 7G , 175 .

Distribution.

A typical cerrado species, which is locally common in Brazil but known elsewhere only from a single location in eastern Bolivia.

BRAZIL. Bahia: Maracás, E. B. dos Santos 295 (NY). Dist. Fed.: J.M. Pires et al. 9110 (S, UB); Chapada da Contagem, H.S. Irwin & Soderstrom 5295 (NY, S); Bacia do Rio São Bartolomeu, E.P. Heringer 6588 (MO). Goiás: Formosa, H.S. Irwin et al. 14280 (MO, NY); Luziania, G. Pereira-Silva et al. 7541 (CEN). Mato Grosso: Malme s.n. [12/5/1903] (S); Cuiabá, G. Hatschbach 32042 (MBM, NY, S); ENE of Barra de Garças, W.R. Anderson 9690 (NY); Rio Turvu, Xavantina, R. de Santos et al. 1634 (K, P, RB). Minas Gerais: P. Clausen s.n. (BM, K, NY); Salinas, Weddell 2185 (P); Perdizes, S. Mendes 634 (HUFU). Tocantins: Serra de Ararais, G. Gardner 5033 p.p. (BM, K); Palmeiropolis, G. Pereira-Silva 10760 (CEN).

BOLIVIA. Santa Cruz: Ángel Sandoval: Santo Corazón, Sunsas-Boca Bella, A. Fuentes et al. 1776 (ARIZ, BOLV, MO, USZ).

Lectotypification.

In designating a lectotype of Ipomoea angulata var. linearis , we have chosen the NY specimen as it appears to have a label in Meisner’s handwriting annotated as "β linearis nob. (29./12./67.)"

Notes.

Distinctive because an erect subshrub with white or pale lilac flowers, the leaves at least 0.5 cm wide and the sepals very unequal. It flowers late in the rainy season unlike most cerrado species.

Although most specimens are readily assigned to either I. squamisepala or I. pinifolia , there is no clear molecular support for their monophyly and some specimens ( Ipomoea angulata var. linearis ) are somewhat intermediate in their leaf shapes.

Figures

Figure 7. Sepals of Ipomoea species. A I. meyeri B I. ternifolia C I. cryptica D I. heterodoxa E I. sericosepala F I. splendor-sylvae G I. squamisepala H I. trifida. Photographs of A (Anderson 1895) B (Pringle 4439) C (Soto et al. 1331) E (Wood & Soto 27550) F (Wilkin 472) and H (Smith 1570) by John Baker; D (Wallnoefer 9506) by John Wood; G (Mendoza 4902) by Moises Mendoza.

Figure 175. Ipomoea squamisepala A habit B inflorescence C outer sepal D inner sepal E corolla opened up to show stamens F ovary and style. Drawn by Rosemary Wise from Kirkbride 5271.