1958] 



THE BOTANY OF THE GUAYANA HIGHLAND PART III 



6] 



5. Clusia cochlitheca Magnire, sp. no v. 



Arbor mediocris; ranmlis acute angulatis, internodiis 2-4 em longis; foliis 

 grandibus, laminis valde chartaceis, elliptieis vel elliptieo-oblanceolatis, 12 em 

 vel vulgo 18-25 em longis, (7) 8-12 em latis, costa prominentia venis lateralibus 

 prominulis ad angulos 20-25° adscendentibus, apiee obtuso vel aliquantum aeuto, 

 basi acuta vel acuminate brevi-deeurrenti ; petiolis crassis, 4-5 mm latis, 1.5-3.0 

 (4.0) cm longis; inflorescentia 1-3-flora; floribus maseulinis: sepalis 8, duobus 

 jugis inferioribus deeussatis, superioribus subimbrieatis, valde seariosomargin- 

 atis, inferioribus late ovatis, 15-20 mm latis, 12-15 mm longis, superioribus or- 

 biculari-oblongis vel oblongo-oblaneeolatis, 20-16 mm latis, 20-26 mm longis; 

 petalis 8 obovato-oblaneeolatis, aliquantum panduriformibus, 3-6 cm longis, 3-4 

 cm latis, albis; staminibus numerosis, 75-100, 3-5-seriatis, extrorsis, in annulo 

 1.0-1.5 mm alto dispositis, filamentis ad basim eompressis, ca. 8-10 mm longis, 

 antheris 1.5-1.8 mm longis, 4-thecatis, valde recurvatis; staminodiis in massa 

 centrali 7-10 mm diam., 1.0-1.5 mm alta aggregatis; floribus f oeminis : sepalis 

 8-10; petalis 8; staminodiis 1-2-seriatis, in corona 4—5 mm alta eomiatis, anan- 

 theris; ovario 8-loculari; stigmatibus 8, sessilibus umbraeuliformibus, cuneatis, 

 5-7 mm longis; fructu maturo non visi, probabiliter 3 cm longo. 



Type: tree 20 m high. 40 cm diam.. cymes 1-3-flowered, sepals white or 

 pinkish, petals 8, wholly white, anthers white, frequent in upper montane wood- 

 land at 1300 m alt.. Dec 4, 1950. Cerro Huachamaeari, Terr. Amazonas, Vene- 

 zuela, Maguire, Cowan d* Wurdack 29832 6. 



Specimens examined : Cerro Huachamaeari: Maguire, Cowan 4' Wurdack 29832$ (holo- 

 type NY) ; tree 30 m high, 50 cm diam., at 1300 m alt., Maguire, Cowan 4' JVurdacTc 29831 9 ;, 

 small tree, at 1200 m alt., Magiure, Cou'an 4- TTurdatl- 29864 9 ; tree 20 m high, at 1000 m alt., 

 Maguire, Cowan 4- Wurdaclc 29965 9 ; tree 10 m high, at 1800 m alt., Maguire, Cowan 4- Wur- 

 daclc 30185 9. Tree 7 m high, occasional at 2000 m alt., Cerro Paru, Terr. Amazonas, Jan 31, 

 1951, Cowan 4' Wurdatlc 31073$ . 



MYRTACEAE 19 



(Calyptranthes and Marlierea) 



Recent collections of plants from northern South America, especially those 

 made by expeditions from the Xew York Botanical Garden, the Chicago Natural 

 History Museum, and the United States Department of Agriculture, have in- 

 cluded numerous specimens of the family Myrtaceae, a great many of which 

 have proved to be new to science. Study of the myrtaceous flora indicates that 

 in the area north of the Amazon River, and south and east of the Orinoco, 

 there is a considerable amount of local endemism. In the two genera considered 

 in this paper, for example, together with approximately 40 species in the region, 

 only about one-tenth of the species are known to range beyond the borders of 

 the Guayana area, and none is widespread elsewhere. 



The genera Calyptranthes and Marlierea are well known in South America 

 east of the Andes and as far south as Uruguay. They have been considered as 

 relatively ''good" genera because of the distinctive features of the calyx, which 

 is calyptrate and circumscissile in Calyptranthes, and opening by irregular longi- 



19 By Rogers McYaugh. 



