Monographs Details: Borreria latifolia var. latifolia f. fockeana (Miq.) Steyerm.
Authority: Maguire, Bassett. 1972. The botany of the Guayana Highland--part IX. Mem. New York Bot. Gard. 23: 1-832.
Family:Rubiaceae
Discussion:

Borreria latifolia var fockeana (Miq.) Brem., Rec. Trav. Bot. Neerl. 31: 307. 1934.

Borreria splitgerberi Brem., Rec. Trav. Bot. Neerl. 31: 307. 1934.

Borreria fockeana Miq., Linnaea 18: 299. 1844.

Borreria bartlingiana DC., Prodr. 4: 544. 1830.

Borreria tetraptera Miq., Linnaea 17: 70. 1843; 18: 298. 1844.

Borreria latifolia var latifolia f fockeana is interpreted as an extremely pubescent variation of B. latifolia. In its extreme form, it differs from B. latifolia in having the angles of the stems long-pilose, the ovary and fruit pilose with usually long hairs, and the upper and lower leaf surface usually sparsely to moderately long-pilose. However, the amount of pubescence varies greatly, and intermediate collections, such as Pennell 1706 and Schultes & Cabrera 16352, emphasize the degree of intergradation. The collection of Reitz & Klein 5925 from Santa Catarina, here cited under the f fockeana of Borreria latifolia, is the basis for the determination as Hemidiodia ocimifolia.

Specimens vary from prostrate to erect-stemmed, and the same plant may show lower leaves long-petiolate and well developed, while the upper leaves and those subtending the inflorescence are reduced and sessile and often fewer-nerved. Bremekamp described B. splitgerberi on the basis of a prostrate plant having only the upper branches with their reduced fewer-nerved, sessile leaves subtending the inflorescences. These upper leaves with four lateral nerves on each side, only 2.5 × 1.5 cm, broadly ovate-elliptic, and rounded to shortly cuneate at the base contrast greatly with those of the lower and middle cauline, which are usually petiolate and with 5-7 nerves on each side. An examination of a large suite of material has shown the inconstancy of the number of lateral nerves, leaf-shape, and pubescence of the stem, the latter varying from pilose only on the angles to pilose or puberulous throughout; moreover, the pubescence of the leaves varies from merely scabrid on the upper leaf surface to sparsely or moderately long-pilose, and that of the lower leaf surface likewise varies. The collection of Wurdack & Monachino 41077, cited under typical B. latifolia var latifolia f latifolia, manifests variation among the several duplicates collected from stems completely glabrous with leaves only sparsely scabrid above to stems with pilose angles and leaves pilose on both sides.