Monographs Details: Isertia parviflora Vahl var. parviflora
Authority: Maguire, Bassett. 1967. The botany of the Guayana Highland--Part VII. Mem. New York Bot. Gard. 17: 1-439.
Family:Rubiaceae
Description:Distribution and Ecology - Trinidad, the Guianas, southern and eastern Venezuela. TRINIDAD. Aripo savannah at Walter Field, Howard 10302; O’Meara Savanna, Britton & Hazen 1560; Mt. Harris, Central Reserve, Gibson 12387; Lockhart s.n.; Purdie sn; Piarco Savanna S of Arouca, Britton, Britton & Hazen 106; Aripo Savanna, Britton, Broadway & Hazen 285; Valencia, Graham 541; Manzanilla, Broadway sn; Aripo Savanna, Long Stretch Forest Preserve, 4-5 miles NE of Comuto Village, Steyermark 90918. FRENCH GUIANA. Maroni, Melinon 406. BRITISH GUIANA. Parabaru Savanna, lat about 2°10'N, watershed between Rupununi and Kuyuwini rivers, A. C. Smith 3068; basin of Rupununi River, near mouth of Charwair Creek, alt about 2°35'N, A. C. Smith 2327; basin of Rupununi River, scrub savanna, Karenambo, lat about 3°45'N, A. C. Smith 2205; Jenman 1769; orchard savanna, Taruk Wan, alt 90 m, Cook 161; Coco of the Rock, Kanuku Mts., alt 450 m, Forest Dept. Field No. WB 654; Wabuwak, Kanuku Mts., Forest Dept. Field No. WB 326. SURINAME. Wilhelmina Gebergte, Zuid Rivier, 3°20'N, 56°49'W-3°10'N, 56°29'W, vicinity Falls Camp, 2 km above confluence with Lucie Rivier, alt 220 m, Maguire, Schulz, Soderstrom & Holmgren 53899; Wilhelmina Gebergte, Lucie Rivier, 2 km N of river, 2 km W of Oost Rivier, 3°20'N, 56°49'W-3°32'N, 56°26'W, Maguire, Schulz, ’Soder-strom & Holmgren 54085; island in Lucie Rivier, 3°20'N, 56°49'W-3°32'N, 56°26'W, Wilhelmina Gebergte, Maguire, Schulz, Soderstrom A Holmgren 54152; riverine forest 2-5 km below confluence of Oost Rivier, Wilhelmina Gebergte, Lucie Rivier, 3°20'N, 56°49'W-3°32'N, 56°26W, alt 225 m, Irwin, Prance, Soderstrom & Holmgien 55480, low scrub thickets, vicinity Kayser Airstrip, 45 km above confluence with Lucie Rivier, Wilhelmina Gebergte, Zuid Rivier ,3°20'N 56°49'W-3°10'N, 56°29'W, alt 270 m, Irwin, Prance, Soderstrom & Holmgren 55913, 2 km above confluence with Lucie Rivier, Wilhelmina Gebergte, ZuidRivier, 3°20'N, 56°49'W-3°10'N, 56°29'W, alt. 220 m, Irwin, Prance, Soderstrom & Holmgren 55760; forest of Zandery, Samuels 512,513,514; river banks below rapids, Jacob Kondre, Saramacca River, Maguire 23S25; via secta ab Moengo tapoe ad Grate Zwiebelzwamp km 12.16, Lanjouw & Lindeman 779; Coppename River near Raleighfalls, Lanjouw 856; granitic plateau in line from Paka paka (Saramacca River) to Ebbatop (v. Asch v. Wijcks Range), near km 8, J. & P. A. Florschutz 1805; Hostmann 1. VENEZUELA. Delta Amacuro: vicinity of large granitic boulders, east side of Rio Cuyubini, Cerro La Paloma, Sierra ima-taca, alt 100-200 m, Steyermark 87612; Bolivar: Igarape, Vista Geral, Rio Cotinga, frontier between Territorio do Rio Branco, Brazil and Estado Bolivar, Venezuela, alt 720 m, B. & C. K. Maguire 40257; river banks 3-5 km below El Carmen (about 50 river km from mouth), Rio Parguaza, alt 110 m, Wurdack & Monachino 40936; selvas alrededor Santa Elena, Lasser 1522; en el margen de los bosques en la sabana, Guayapo, Bajo Caura, alt 100 m, Williams 11847; en la margen de un carobal en la sabana de El Tigre, cerca del Rio Cuchivero, alt 90 m, Williams 13402; Campo Cardona, Alto Rio Suapure, 6°15'X, 66°25'OE, alt 400 m, Vareschi 7583; morichal 0.5—1 km E of ranch house, Hato La Vergarena, lat 6°45'N, long 63o30'W alt 390 m, Wurdack 266; selva alta que Uega hasta el pie del Cerro El Tigre, alt 90 m, Williams 13331; en el margen de los moriehales, Guayapo, Bajo Caura, alt 100 m, Williams 11743; Amazonas: entre rocas, Puerto Ayacucho, alt 120 m, Williams 15877; a orillas del Rio Parueito, lat 60°, long 65°43', Brewer 21.

Discussion:

Isertia parviflora Vahl, Eclog. Am. 2: 28. 1798.

Brignolia acuminata DC., Prodr. 4: 444. 1830.

Brignolia pubigera Benth., Jour. Bot. Hook. 3: 219. 1841

.

Bruinsmannia isertioides Miq., Linnaea 17: 73. 1843.

Type. Trinidad, Ryan.

Schumann erroneously keyed out this species under “ovarium hexamerum, stilus sexfidus” (Fl. Bras. 6(6): 284). The material of the species examined by me uniformly manifests 4 styles and a 4-celled ovary. There is considerable variation within this taxon in the amount of pubescence present on the outer surface of the calyx and hypanthium and on the peduncles, branches of the inflorescence, pedicels, and bracts. In some cases the inflorescence is very short, in other cases more prolonged.

In most collections of this taxon, the summit of the calyx is slightly to moderately undulate, but in Lanjouw & Lindeman 801 from Suriname the calyx is much more prominently lobed with deltoid-ovate to broadly ovate-triangular or triangular-lanceolate and acute lobes varying from 0.5-1.2 mm long by 0.5-1 nun broad. The lobes are similarly pubescent as in var parvifiora with the hypanthium and most of the calyx glabrous except sparsely puberulous near the apex and at the margin of the lobes.

Distribution:Trinidad and Tobago South America| Guyana South America| Venezuela South America| French Guiana South America| Suriname South America|