Monographs Details: Conceveiba guianensis Aubl.
Authority: Maguire, Bassett. 1967. The botany of the Guayana Highland--Part VII. Mem. New York Bot. Gard. 17: 1-439.
Family:Euphorbiaceae
Description:Distribution and Ecology - Guianas, Delta Amacuro, the Hylaea, Upper Orinoco, Bolivar, Mato Grosso and eastern Peru. It is not known south of the Hylaea. SURINAME. Zanderij I, 7 Nov 1918, Tree N. 104, Herb. n. 4073 (2 NY) ; Zanderij I, Sep 1942, Feb 1943, May 1943, N 60 Mabi (sterile NY) ; Mt. Nassau, in secondary forest near km 0.2, 16 Feb 1949, Lanjouw & Lindeman 2124 (2 NY); vicinity of Moengo, Cottica River, 20 Mar 1955, Maguire 40829 (female NY). BRITISH GUIANA. Kara-kara Creek, 15 Feb 1910, CWA 464 (female lvs. large, glands large NY); between the Demerara and Berbice rivers, lat 5°10'N, 15-19 Jul 1922, De La Cruz 1650 (female fr. NY); Kamakusa, Upper Mazaruni River, long 59°50'W, 11-22 Jul 1923, De La Cruz 4170 (female fr. lvs. large NY); forest and riverside, clayey soil, Jul 1924, Persaud 52 (female fr. NAM; Morabelli Creek, Essequibo River, alt 50 ft, 3 Dec 1938, F 154, R. N. 2763 (female fr. NY) Mazaruni station, 23 Jun 1942, F.N. 737, R.N. 3473 (2 fr. NY); Potaro River gorge, 7 May 1944, Maguire & Fanshawe 23523 (female fr. NY); no detailed location, 23 Jul 1952, FN 3429, RN 6993 (female fr. NY); Upper Mazaruni River basin, Kukui River, alt 500 m, 5 Sep 1960, Tillett & Tillett 45275 (female fr. NY; southern Pakaraima Mts., along Ireng River, between Waipa and Sand Hill Rapids, 19 Sept 1961, Maguire, Maguire & Wilson-Browne 46248 (female fr. NY). VENEZUELA. Delta Amacuro: E of Rio Grande, ENE of El Palmar, near the border of Est. Bolivar, 24-25 Feb 1964—16 Jan 1965, Berti 96, 105, 583 (sterile NY) ; Bolivar: Rio Apacare, Uriman region, alt 400-500 m, 16 Aug 1954, Bernardi 1433 (fr. NY); Chimanta Massif, Torono-tepui, below Base Camp along Rio Tirica to mouth of Rio Totono, alt 500-515 m, 9 Mar 1955, Steyermark & Wurdack 1310 (fr. NA") ; Icabaru river region, nameless mountain 280° from the head of Rio Hacha, alt 450-850 m, 2 Jan 1956, Bernardi 2733 (fr. NY); Nuria plateau, vicinity of Quebrada Agua Linda, 8-11 km E of Nuria camp, E of Hato Nuria, near pica 35 and 106, alt 650 m, 19 Jul 1960, Steyermark 86502 (fr. angular NY); Amazonas: Casiquiare, 11 Dec 1945, Froes 21497 (2 NY) ; Rio Atabapo, occasional, Yavita-Pimichin trail, near Yavita, alt 130 m, 10 Jun 1959, Wurdack & Adderley 42927 (fr. NY). BRAZIL. Para: Belem, 23 Dec 1942, Archer 8041 (fr. NY); Belem, Rio Guama, Igapo, 9 Oct 1946, Pires 18 (fr. NY) ; Belem, Sep-Oct 1961, Pires 51710 (female NY); Amazonas: Mapaos, Colonia Soao Alfredo, 27 Oct 1941, Ducke 827 (2 NY); Manaos, Estrada Campos Salles, 4 Jan 1941, Ducke 663 (fr. NY); Esperanca, ad ostium fluminis Javary, 1 Oct 1942, Durkc 107 V (J1 NY); Esperanca, ad ostium fluminis Javary, 31 Oct 1942, Duckc 1076 ($ NY) ; near mouth of Rio Embira, tributary of Tarauca, lat 70°15'W, 17 Jun 1933, Krukoff 4890 (5 NY) ; Municipality Humayta, near Tres Casas, 14 Sep-11 Oct 1934, Krukoff 6242 (male NY), 6475 (male NY), near Livramento, 12 Oct- 6 Nov 1934, Krukoff 6643 (male NY); on plateau between Livramanto and Rio Ipixuna, 7-18 Nov 1934, Krukoff 7105 (female NY); Municipality Sao Paulo de Olivenca, near Palmares 11 Sep-26 Oct 1936, Krukoff 8396 (type of C. krukoffii juvenile female NY) Krukoff 8533 (fr. NY), 26 Oct- ll Dec 1936, Krukoff 8609 (male NY), 8616 type of C. simulata Steyerm. NY); Municipality Sao Gabriel, Santo Antonio Basin of Vaupes River, 11 May 1942, Froes 891 (sterile NY) ; Mato Grosso: near Tabajaza, upper Machado river region, Nov.-Dec 1931, Kmkoff 1453 (fr. NY). PERU. Mouth of Rio Santiago, Tessmann 4149 (c? NY), 4351 (J1 NY) ; Iquitos, Aug 1925, Tessmann 5324 (male NY) Loreto: Gamitana cocha, Rio Maxan, alt 100-125 m, 3 Mar 1935, Schunke 341 (male NY)

Discussion:

Conceveiba simulata Steyermark, Field Mus. Publ. Bot. 17: 416. 1938 (type, Krukoff 8616).

Conceveiba krukoffii Steyermark, Field Mus. Publ. Bot. 17: 414. 1938. (type, Krukoff 8396).

Type. “Habitat ad ripas fluvii Sinemari & amnis Galibiensis.” Originally described without male flower. Muller-Argoviensis cites 3 specimens from French Guiana: Poiteau, Leprieur n. 315, Sagot n 508; which of these is Aublets type, he doesn’t say. All he says about male flowers; “Flores masc. aperientes 1 mm lati.” The figure in Flora Brasiliensis depicts the male flower as carrying a great number of sterile, ribbon-like stamens and a few wide-filamented stamens. The origin of the specimen is not mentioned.

Note that all of the male specimens come from the westernmost margin of the distribution area. These were separated under the name of C. simulata Steyerm. and were thought to differ from C. guianensis in “much shorter staminate inflorescence, and in possessing a greater number of fertile and sterile stamens, usually 9 fertile and 9-10 sterile.” But since there is not a single male specimen from the type locality or from the east it is difficult to work out a basis for distinction. C. krukoffii Steyermark was thought to differ “from C. guianensis principally in the longer style column, 3 mm long,” but the type is a juvenile specimen and the length of style column seems to be very variable. The Bolivar specimens (all fruit) approach C. hostmanni in so far as the fruits are globose, not alate, and the leaves tend to be subcordate at the base.

Distribution:Suriname South America| Brazil South America| Peru South America| Guyana South America| Venezuela South America|