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4. 574 FIELD MUSEUM OF NATURAL HISTORY BOTANY, VOL. XIX united below the middle to form a tube, but they soon separate and, together with the petals, stamens, and corona, fall off, leaving a very small receptacle and the persistent gynophore, ovary, and styles, the receptacle being little more than the slightly enlarged apex of the pedicel. The number of sepals and petals is uncertain. In both his generic descriptions Masters says there are "4-5" of each, but he described D. retusa and D. acuminata as having five of each. The drawing of the flowers of D. retusa and D. Wallisii indicates that only four sepals and four petals are present; no flowers of D. acuminata are shown in the plate. Mr. N. Y. Sandwith, who has carefully examined the specimens at Kew for me, writes that two flowers of the type of D. retusa have five petals and apparently four sepals, and that the flowers of D. acuminata are so badly mutilated that no decision is possible. The well prepared specimens now in the United States National Herbarium all have four sepals and four petals, the two outer sepals being nearly twice as wide as the inner ones. The difference in the description of the corona as given by Masters and as presented above is largely a matter of definition of the terms. (See the excellent drawing of Dilkea Johannesii var. parvifolia Hoehne, Comm. Linh. Tel. Matto Grosso, Annexe 5, Bot. pt. 5: pi. 111. 1915.) Sepals not more than 1.5 cm. long; ovary subsessile (Peru). Sepals 2 to 3 cm. long; ovary borne on a short gynophore. 1. D. parviflora. Leaves cuneiform, truncate at the upper margin except for a short lobe at the center (Peru and Brazil) 2. D. retusa. Leaves ovate, ovate-oblong, or oblanceolate, rounded or acuminate at apex. Fruit ovoid, more than twice as long as wide (Brazil). Fruit globose or spherical. 3. D. Johannesii. Leaves oblanceolate or oblong-oblanceolate, more than 3 times longer than wide; sepals and petals 5 each(?); fruit globose, about 6 cm. long (Brazil) . D. acuminata. Leaves variable, broadly ovate, ovate-oblong, or oblongoblanceolate, usually less than 3 times longer than wide; sepals and petals 4 each; fruit depressed-spherical, about 2.5 cm. long (Peru and Brazil) 5. D. Wallisii.
AMERICAN PASSIFLORACEAE 575 1. Dilkea parviflora <strong>Killip</strong>, sp. nov. Scandens, lignescens, ubique glaberrima; folia obovata, apice rotundata, basi subrotundata vel subacuta, coriacea; flores pro genere parvi, albidi, in glomerulis densis subsessilibus, pedicellis crassis, brevibus; coronae filamenta externa anguste liguliformia, sepalis subaequalia, interna anguste flabellata; ovarium subsessile. Woody vine, glabrous throughout; leaves obovate, 15 to 18 cm. long, 8.5 to 10.5 cm. wide, rounded at apex, subrotund or subacute at base, entire, coriaceous, lustrous; flowers white, in dense, subsessile glomerules, the pedicels stout, about 2 mm. long; sepals 4, oblong, 1.2 to 1.5 cm. long, the 2 outer 8 to 10 mm. wide, the inner 5 to 6 mm. wide, obtuse; petals 4, as long as the sepals, slightly narrower, obtuse; corona in 2 series, the outer filamentose nearly to the base, the filaments narrowly liguliform, about 1.3 cm. long, the second series cleft nearly to the base into narrowly flabellate segments about 1 cm. long, which are densely crispate-floccose in the upper half; stamens 8, their filaments about 6 mm. long, united at very base; anthers linear-oblong, 3 to 3.5 mm. long, nearly 1 mm. wide at base; ovary subsessile; styles 1.2 to 1.5 cm. long, the united portion barely 1 mm. long; stigmas 1.5 to 2 mm. wide. Type in the United States National Herbarium, No. 1,456,095, collected at Mishuyacu, near Iquitos, Department of Loreto, Peru, altitude 100 meters, April 2, 1930, by G. Klug (No. 1158). Duplicate at Field Museum. I hesitate to propose a new species in this genus inasmuch as the other species may well have to be reduced to one. The flowers, though fully developed, are much smaller than in the other species; the gynophore is almost completely lacking; and the anthers are proportionately broader. 2. Dilkea retusa Mast. Trans. Linn. Soc. 27: 628. 1871; in l&art. Fl. Bras. 13, pt. 1: 534. pi. 106, f. 1. 1872. Woody vine, glabrous throughout; petioles stout, 2.5 to 3 cm. long, glandless; leaves cuneiform, 15 to 20 cm. long, 7 to 11 cm. wide, at apex truncate, usually retuse toward center with the midnerve terminating in a very short lobe, at base cuneate, coriaceous, lustrous, the lateral nerves divaricate at nearly a right angle from the midnerve, slightly ascending, anastomosing into a submarginal nerve; flowers white, in compact, 6-8-flowered, subsessile glomerules, the pedicels about 1 cm. long; bractlets subulate, about 0.7 mm. long; calyx tube campanulate-funnel-shaped, 8 to 12 mm. long, 8 to 10 mm.
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THE UNIVERSITY OF ILLINOIS
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THE AMERICAN SPECIES OF PASSIFLORAC
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PRINTED IN THE UNITED STATES OF AME
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