Syzygium cordatum x guineense [family MYRTACEAE]

Herbarium
Royal Botanic Gardens, Kew (K)
Collection
Flora Zambesiaca
Resource Type
Reference Sources
Entry From
FZ, Vol 4, Part 0, page 183, (1978) Author: F. White
Names
Syzygium cordatum x guineense [family MYRTACEAE], —F. White, F.F.N.R.: 303 (1962) pro parte excl. specim. White 3029 et Morse 44. TAB. 45 fig. B.
Syzygium intermedium Engl. ex Engl. & von Brehm. [family MYRTACEAE], in Engl., Bot. Jahrb. 54: 339 (1917).—Brenan & Greenway, T.T.C.L.: 380 (1949).—Wild, Guide Fl. Vict. Falls: 145(1953).— Boutique in F.C.B. Myrtac.: 12, t. 1 fig. h (1968). Types: Rhodesia, Victoria Falls, in “rain forest”, 930 m., fl. September 1905, Engler 2961, 2965a (B+, syntypes) and from Tanzania and Natal.
Information
Small or medium-sized tree 4–15 m. tall. Young stems quadrangular and slightly winged. Leaf-lamina up to 15 x 6·5 cm., mostly lanceolate-elliptic to oblanceolate-elliptic, apex rounded to acute, very rarely very shortly subacuminate, base (at least of some leaves, subcordate or very broadly rounded; petiole 0·2–0·6 cm. long. Receptacle (including pseudopedicel) + calyx + upper receptacle 0·45–0·6 cm. long; calyx + upper receptacle 0·2–0·3 cm. long; filaments 0·8–1·2 cm. long. Fruit c. 1·8 x 0·9 cm., purple-black, urceolate, persistent calyx + upper receptacle 0·2 cm. long x 0·5 cm. wide.
Habitat
In fringing forest and swamp forest. Over most of its range it appears to be rare and sporadic. In the “rain forest” of the Victoria Falls, however, it seems to replace S. cordatum and S. guineense and is the commonest tree there forming the bulk of the canopy.
Distribution
Mozambique M Maputo Distr., between Goba and Catuane, fl. 24.x.1940, Torre 1863 (LISC).Mozambique GI Bazaruto I., st. 28.x.1958, Mogg 28694 (LISC); Muchopes, fr. 26.i.1941, Torre 2549 (LISC).Mozambique T Marávia Distr., Fíngoè, fl. 24.ix.1942, Mendonça 392 (LISC).Malawi S Blantyre Distr., Ntunda, fl. immat., Topham 479 (FHO).Zimbabwe S Belingwe Distr., Ngobe dip, 825 m., fl. 11.xii.1953, WildWs (K).Zimbabwe E Chipinga Distr., Chikore Hills, 1065 m., fl. 11.xi.1906, Swynnerton 1309 (BM).Zimbabwe C Salisbury Distr., Hatfield, 1495 m., fl. 26.ix.1965, Simon 474 (K; LISC; SRGH).Zimbabwe W Victoria Falls, “rain forest”, fl., Allen 56 (K).Zambia S Livingstone Island, Victoria Falls, st. 10.viii.1929, Burtt Davy 20506 (FHO).Zambia E Chipata (Fort Jameson) Distr., Lunkwakwa R., 1070 m., fl. 18.ix.1960, Wright 272 (K).Zambia C 9 km. E. of Lusaka, 1220 m., fl. 27.ix.1955, King 156 (K).Mozambique Z Serra do Gúruè, 1200 m., fl. 4.xi.1967, Torre & Correia 15870 (LISC).Malawi C Dedza Distr., Chongoni Forest, fl. immat. 14.vii.1969, Salubeni 1367 (K).Zimbabwe N Sebungwe Distr., Karyangwe, 850 m., fr. 15.xi.1958, Phipps 1477a (K; SRGH).Zambia N Kawambwa, fl. 26.viii.1957, Fanshawe 3556 (K).Botswana N Moremi Wildlife Reserve, N. of Okavango Swamp, fl. immat. Tinley 1081 (K).
Distribution (external)
Kenya
Tanzania
Pemba I.
Zaire
Angola
S. Africa (Transvaal, Natal and the Transkei)
Notes
Most of the specimens cited appear to be hybrids between S. cordatum and S. guineense subsp. guineense. Tinley 1081 from the Okavango Delta, Botswana is intermediate between S. cordatum and S. guineense subsp. barotsense. Both taxa are at the southern limits of their range there and are the only Syzygiums known to occur. Possible hybrids between S. cordatum and S. guineense subsp. afromontanum are described under S. masukuense (see p. 197). Fries 727 from Bwana Mkubwa, Zambia, is cited (Fries loc. cit.) as S. intermedium. Although some leaves are slightly subacuminate it agrees with S. cordatum in all other respects, and, until field and experimental studies can be made, is in my opinion best regarded as belonging to that species. The following specimens from riverine habitats differ from S. guineense subsp. guineense in their shorter petioles and much less attenuate leaf-bases. They may represent backcrosses with S. guineense or segregates from the hybrid. Zambia. E: Chipata (Fort Jameson), fl. 2.x.1966, Mutimushi 1538 (FHO). S: Mapanza, fl. 11.x.1953, Robinson 349 (K). Malawi. Mwaka Syunguti, fl. 24.ix.1930, Migeod 950 (BM).
Syzygium cordatum x guineense [family MYRTACEAE]
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