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576 FIELD MUSEUM OF NATURAL HISTORY BOTANY, VOL. XIX wide at throat; sepals 4 or 5, at first united below middle into a funnel-shaped tube, at length separating, oblong, 1.5 to 2.5 cm. long, obtuse, the 2 outer 5 to 6 mm. wide, the 2 inner 3 to 4 mm. wide; petals 4 or 5, subequal to the sepals, 3 or 4 mm. wide; corona in 2 series, the outer filamentose to the lower quarter, the filaments liguliform, 2 to 2.5 cm. long, the inner united near base, filiform in lower half, spatulate-dilated in upper half and margined with floecose, crispate threads; stamen filaments 2 to 2.5 cm. long; anthers narrowly linear; ovary ovoid, short-stipitate, the stipe stout, about 3 mm. long; styles about 2.5 cm. long, united for about 11 mm. above the base; stigmas about 2 mm. wide. TYPE LOCALITY: Manaos, Amazonas, Brazil. ILLUSTRATION: Mart. Fl. Bras. 13, pt. 1: pi. 106, f. 1. DISTRIBUTION: Amazon basin of Peru and Brazil. PERU: Loreto: Mishuyacu, near Iquitos, Klug 1017 (F, N, Y). BRAZIL: Amazonas: Manaos, Spruce 1320-5 (K, type). 3. Dilkea Johannesii Barb. Rodr. Vellosia 1: 22. 1891; 3, pt. 1: pi. 10. 1891. Dilkea Ulei Harms, Verhandl. Bot. Verein. Brandenburg 48: 184. 1906. (l)Dilkea Johannesii var. parvifolia Hoehne, Comm. Linh. Tel. Matto Grosso, Annexe 5, Bot. pt. 5: 73. pi. 111. 1915. Low shrub, with scandent branches, without tendrils or sometimes with a few weak ones, glabrous throughout; petioles 1 to 3 cm. long, enlarged at base, glandless; leaves oblanceolate or oblong, 12 to 30 cm. long, 6 to 8 cm. wide, abruptly acuminate, attenuate at . base, coriaceous, lustrous, the lateral nerves divaricate at nearly a right angle from the midnerve and united into a sinuate, submarginal nerve; flowers white, in subsessile, axillary or terminal, compact clusters, the pedicels up to 1 cm. long; sepals 4, at first united into a cylindric tube, soon separating, linear-oblong, obtuse, 2 to 2.5 cm. long, the 2 outer about 10 mm. wide, the 2 inner about 5 mm. wide; petals 4, subequaling the sepals, about 5 mm. wide; corona in 2 series, the outer filamentose, the filaments narrowly liguliform, 2 to 2.5 cm. long, the inner tubular, cleft above the middle into lacerate, floccose segments; ovary ovoid, short-stipitate; fruit ovoid, 7 to 9 cm. long, about 3 cm. in diameter, acuminate, yellow; seeds ovoid, about 1 cm. long and 7 mm. wide, slightly compressed. TYPE LOCALITY: Manaos, Brazil.
AMERICAN PASSIFLORACEAE 577 ILLUSTRATIONS: Vellosia 3, pt. 1: pi. 10; (?)Comm. Linh. Tel. Matto Grosso, Annexe 5, Bot. pt. 5: pi. 111. DISTRIBUTION: Middle Amazon basin, Brazil. BRAZIL: Amazonas: Manaos, Ule5381a (B, type of D. Ulei, Go); Ducke 500 (N). Campina- de Tanacoera, lower Rio Negro, Ducke 11535 (Gen, Go). Para: Faro, Ducke 3718 (Go), 8460 (Gen, N, P), 8692 (Gen, Go). Obidos, Ducke 12040 (Go). LOCAL NAMES: "Akuti-kaa," "paka-rupia." Ducke has observed that the leaves of D. Johannesii are quite variable, even in an individual plant. Hoehne's variety parvifolia may well represent another species. The illustration shows leaves narrowly oblong or narrowly oblanceolate, 8 to 12 cm. long and not more than 2 cm. wide, their lateral nerves strongly ascending and not at all anastomosing near the margin. 4. Dilkea acuminata Mast. Trans. Linn. Soc. 27: 628. 1871; in Mart. Fl. Bras. 13, pt. 1: 535. pi. 106, f. 2. 1872. Scandent shrub, glabrous throughout; petioles 1 to 1.5 cm. long, glandless; leaves oblong-oblanceolate, 15 to 35 cm. long, 4 to 14 cm. wide, abruptly acuminate, attenuate at base, coriaceous, lustrous, cartilaginous at margin, the lateral nerves divaricate or ascending; peduncles apparently solitary, 4 to 6 cm. long; flowers white; sepals 4 (or 5?), oblong, about 3 cm. long, obtuse; petals 4 (or 5?), subequal to the sepals; corona, stamens, and style similar to those of D. retusa; fruit globose, about 5 cm. in diameter, coriaceous. TYPE LOCALITY: Manaos, Brazil. ILLUSTRATION: Mart. Fl. Bras. 13, pt. 1: pi. 106, f. 2. DISTRIBUTION: Amazonian basin of Brazil. BRAZIL: Amazonas: Manaos, Spruce 1320-3 (K, type). There are many points of uncertainty regarding this species. It was first described in the Transactions of the Linnean Society in a resum by Masters of his treatment of Passifloraceae for the Flora Brasiliensis, in press at the time this resum was published. The descriptions of both D. acuminata and D. retusa in the Transactions are much briefer than in the later publication, and do not mention the fruit, though there is a description of fruit in the generic diagnosis. In the Transactions two specimens are cited under D. retusa, Spruce 1320-5, Barra (i.e., from Manaos), and a Martius plant from
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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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