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Project Name Data (Last Modified On 1/14/2013)

Flora Data (Last Modified On 1/14/2013)
PlaceOfPublication Prod. Veg. Ind. Occ. 3:1566. 1806
Synonym Aristolochia gigas Lindl. Bot. Reg. t. 6o. 1842. Howardia grandiflora Klotzsch, in Monatsb. Acad. Berl. 1859:610. 1859. Aristolochia grandiflora p hookeri Duch. in DC. Prod. 15-1:473. 1864.
Description Twining lianas, older stems ridged with cork. Leaves alternate, cordate, apex acute to acuminate, membranous, 5 to 20 cm. broad, 7 to 30 cm. long, densely pilose to velutinous becoming nearly glabrous on upper surface. Pseudostipules absent. Flowers immediately subtended by an acuminate foliaceous bracteole, borne on young stems, axillary, solitary, ca. 3 m. long, the color white blotched with purple, pilose, the utricle broadly gibbous-clavate, ca. 45 cm. long, the tube sharply reflexed on the utricle, ca. 40 cm. long, the limb obliquely salverform, terminating in a filiform extension from the medial lower edge, the odor of "old tobacco". Fruit ovate-cylindric, 10 cm. long, 4 to 6 cm. wide, dehiscing acrop- etally. Seeds numerous, horizontally compressed, 1 cm. diameter, 3 mm. thick.
Habit lianas
Distribution Panama, south throughout Amazonia.
Specimen DARIEN: vicinity of Yape, alt. 30 m., Allen 647.
Note his species rarely is collected. It appears that practically all of the large- flowered Aristolochia collections have been named grandiflora, but are properly A. arborescens. There is a relatively sharp distinction between the two species. A. grandiflora has truly a huge flower, perhaps the largest in American tropics, a total reported axial length in excess of 4.5 meters, while A. arborescens is about one- fourth as large. The flowers of the former are velutinous without and differ in color and odor from the latter. A. arborescens has a well-differentiated throat, while A. grandiflora is not markedly endowed with this feature.
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