Monographs Details: Chamaecrista glandulosa var. rapidarum H.S.Irwin & Barneby
Authors:Howard S. Irwin, Rupert C. Barneby
Authority: Irwin, Howard S. & Barneby, Rupert C. 1982. The American Cassiinae. A synoptical revision of Leguminosae tribe Cassieae subtrib Cassiinae in the New World. Mem. New York Bot. Gard. 35, part 2: 455-918.
Family:Caesalpiniaceae
Description:Latin Diagnosis - Chamaecrista glandulosa (Linnaeus) Greene var. rapidarum Irwin & Barneby, var. nov., var .flavicomae praesimilis sed glandula petiolari crassa, florum maximorum sepala 12-16 (nec 8-12) mm usque, petalum abaxiale planum 15-23 (nec 11-15) mm longa, legumine angustissimo 3.5-4 (nec 4.7-6) mm lato, patriaque procul distanti diversa.-VENEZUELA. Bolívar, savanna edge at Laja Caruto, 80-90 m, e. bank of Rio Orinoco just below Raudal Marimare, 18.XII.1955 (fl, fr), J. J. Wurdack & J. V. Monachino 39975.

Species Description - Shrubby or subshrubby to 2 m, thinly strigulose-pilosulous with appressed or incumbent hairs to 0.25-0.5 mm, the concolorous olivaceous lfts usually remotely strigulose beneath, ciliolate. Stipules (4-)4.5-14 x 0.5-1 mm, 6-8-nerved. Major lvs up to 5-11 cm, the petiole (4-)5-9 mm; glands l-2(-3), broadly elliptic, convex or shallowly dimpled, 0.8—2 mm diam, subsessile, in profile squatly drum-shaped or obconic, 0.6—1 mm tall, (0.2—)0.4—1 mm shorter than diam of head; lfts of major lvs up to 16—24 pairs, oblong obtuse mucronulate to 12—20 x 2—4 mm, the midrib giving rise to 4-6(-7) pairs of major with or without faint intercalary secondary venules, these faintly prominulous on both faces. Peduncles 6-17(-30) mm adnate through 2—15(—21) mm, l-4(-5)-fld; pedicels up to 12-24 mm; sepals up to 12-16 mm; long abaxial petal 15-23 x 10-15; style 6.5-8.7 mm filiform; ovules 16-21. Pod 40-60 x 3.5-4 mm, incumbent-pilosulous.—Collections: 4.

Distribution and Ecology - Habitat little known, sometimes at savanna margins, below 120 m, apparently very local along the banks of río Orinoco near and immediately below the mouth of río Meta, in n.-e. Vichada, Colombia, and adjoining Bolívar (presumably also Apure), Venezuela.—Fl. VIII-I.

Discussion:

Notable for the syndrome of extremely large flower, coarse subsessile petiolar gland, and narrow elongate pod, var. rapidarum cannot well be assimilated into any described form of Ch. glandulosa. In the diagnosis we have compared it to Peruvian var. flavicoma, similar in general appearance but different in the smaller flowers and broader pods. It is, however, very likely more closely related to its near neighbor var. crystallina, similar in the proportions of glands and pods but very much smaller-flowered, the sepals only 7-10 (not 12-16) and long abaxial petal only 8-11 (not 15-23) mm long,.

The var. rapidarum was collected first somewhere on the banks of the Orinoco by the French naturalist-explorer Jean Chaffanon in 1886 (P).

Distribution:Meta Colombia South America| Colombia South America| BolĂ­var Colombia South America| Vichada Colombia South America|

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