Passiflora trialata (Passifloraceae), a New Species of Granadilla (Passiflora subg. Passiflora) from French Guiana

Abstract

A new species, Passiflora trialata (Passifloraceae: subg. Passiflora), from French Guiana, South America, is described and illustrated from living cultivated material. Its affinities to the P quadrangularis L. species complex are discussed. Fieldwork in French Guiana by the senior author has resulted in the addition of several new species of passionflowers in several sections and subgenera (Feuillet & Cremers, 1984; Feuillet, 1986, 1994). There are now recorded 30 species of Passifloraceae including 27 species of Passilora in French Guiana, of which 9 are endemic (modified from Feuillet, 1989). We describe here a species of Passiflora subg. Passilora, closely allied to P alata Curtis and the Giant Granadilla, P quadrangularis L., and like them with angled-alate stems. Two young plants were found sterile in 1988 by the senior author at Montagnes Tortue. Photographs were taken and one specimen was preserved. In 1991, on the slopes of the same table mountain, a sterile plant was found and cuttings were taken and brought into cultivation in Maryland, U.S.A. No herbarium specimen was made. Cuttings from this plant were distributed, but all the plants except one died. That plant flowered at the Missouri Botanical Garden in 1994-1996, and the description below is made almost entirely from that plant. The floral measurements are based on 10 fresh flowers. Passiflora trialata Feuillet & J. MacDougal, sp. nov. TYPE: Cultivated in greenhouse at Missouri Botanical Garden 1991-1996, specimens made 7 Sep. 1994, from plant collected in French Guiana, roadside of Piste forestiare de B6lizon, 21 km from Cayenne-Regina road (RN 2), 4?15'N, 52?30'W, 150 m, 30 Oct. 1991, by C. Feuillet, MacDougal 6009 (holotype, US; isotypes, MO, P, AAU). Figures 1, 2. Species haec in Passiflora subg. Passiljora pertinens; caulis 3-angulatocarinatus; stipulae 23-32 mm in longitudinem; folia non lobata, integra; petioli glandes duae, arietinorum cornuum instar, luteolae v. albidae; bractae latae, foliaceae, 6-8.6 x 3.5-6.5 cm, integrae, non glandulosae; floris cupula campanulata v. infundibuliformis; sepala non cornuta; corona erecta, duas extimas series subaequales et octo intimas series minus quam 3 mm longas constatas et tuberculis v. filamentis habens; androgynophorum 21-23 mm longum; fructus incognitus. Climbing vine, adult size unknown but flowering in the greenhouse at 3 m long, glabrous and somewhat glaucous throughout. Stems sharply 3-angular and 3-carinate/alate in both juvenile and flowering material, the growing tip negatively geotropic, or on generally horizontal growth, the tip slightly inclined below horizontal but not cernuous, the stem becoming pink with light yellowish green wings. Phyllotaxy helical 2/, appearing '/2 at shoot tip. Prophylls of the vegetative ramifying bud 2, subequal or unequal in size. Stipules 23-32 x 8-13 mm, narrowly ovate to narrowly oblong-ovate, slightly eccentric, the margins entire, the apex acute; petioles triangular in cross section, alate, the lower wing connected with a stem wing, 2.8-5 cm long, 2-glandular, the glands narrowly ovoid in juvenile growth, at flowering nodes the glands 4-7 mm long, flattened conic (triangular), 4-5 mm wide at base (never narrowed at base) and sometimes distally elongate and curved like the horns of a ram, yellowish green to pale yellow (cream); laminas 15-26.5 x 8.5-16 cm, unlobed, ovate, with 7-10 main veins per side, yellowish green, not variegated, entire, the base obscurely or shallowly cordate, the apex abruptly acute. Peduncles 1 per node, 4.0-6.0(7.5) cm long, 2 mm wide at base, 6-7 mm wide at insertion of bracts, sharply triangular and carinatealate in cross section; bracts 3, adpressed at base but free to base, (6.0-)7.0-8.5(-9.4) cm long along midvein (6.5-10.0 cm total outline length), (3.5-) 4.5-6.5 cm wide, ovate-triangular, shallowly cordate at base, apex acute or abruptly obtuse, foliose, eglandular, pale green to light yellowish green, glaucous, the margins entire; floral stipe 13-18 mm total length, including 5--6 mm hidden in toroid NovoN 6: 351-355. 1996. This content downloaded from 157.55.39.171 on Sat, 23 Jul 2016 06:01:36 UTC All use subject to http://about.jstor.org/terms