STANDLEY TREES AND SHRUBS OF MEXICO. 559 



11. Guarea excelsa H. B. K. Nov. Gen. & Sp. 7: 227. 1825. 



Topic to Guerrero ; type collected near La Venta de Acaguisotla, between 

 Acapulco and Zunipango, Guerrero. 



Tall tree ; leaflets 2 to 4 pairs, elliptic-oblong to oblong, 8 to 16 cm. long, 

 obtuse to short-pointed ; panicles 6.5 cm. long or less, narrow ; petals sparsely 

 strigillose, 4 mm. long; capsules subglobose, 1.5 cm. thick, 4-seeded. 



AVrongly referred by Caslmir De Candolle to Guarea humilis Bert., a West 

 Indian species. 



11a. Guarea excelsa dubia Blake, Proc. Biol. Soc. Washington 34: 116. 1921. 

 Known only from the type locality, Maria Madre Island, Tepic. 

 Ovary sparsely strigose; capsule strigillose. 



12. Guarea virescens C. DC. Ann. Cons. Jard. Geneve 10: 140. 1907. 



Known only from the type locality, banks of the Rio Coyaquilla, Michoacan 

 or Guerrero. 



Tree, 15 meters high ; leaflets 2 or 3 pairs, elliptic to obovate-oblong, short- 

 acuminate, 11 to 21 cm. long, 6 to 8.5 cm. wide ; petals 4, acute, appressed- 

 pilosulous ; staminal tube appressed-pilosulous above ; gynophore puberulous ; 

 ovary 4-celled, the cells 1-ovulate. 



DOUBTFUL AND EXCLUDED SPECIES. 



Guarea glabke&cens (Hook. & Am.) Blake. 



Sapindus glahrescens Hook. & Arn. Bot. Beechey Voy. 281. 1836-1840. 



Guarea fulva j3 mexicana C. DC. in DC. Monogr. Phan. 1 : 575. 1878. 



Mexico. 



Leaflets 2 to 4 pairs, oblong-lanceolate, about 11 cm. long, beneath subvillous 

 over whole surface when young, in age only along the veins ; inflorescence 

 paniculate ; capsule subtrigonous, scarcely lobed, about 1 cm. long, often by 

 abortion 2-celled. 

 Guarea hirsuta C. DC. in DC. Monogr. Phan. 1 : 578. 1878. 



Described by De Candolle from " New Spain " and listed by Hemsley, but a 

 later collection shows it to be a South American species.' 

 Guarea palmeri Rose; C. DC. Bot. Gaz. 19: 39. 1894. 



Colima ; type from Manzanillo. Guatemala ; El Salvador. 



Tree, 5 meters high ; leaflets 2 to 6 pairs, oblong or obovate-lanceolate, 12 cm. 

 long, 4 cm. wide, pilose in the axils beneath ; panicles racemiform ; sepals 4, 

 obtuse ; ovary glabrous ; capsule subglobose, 4-celled, 2 cm. long. 



4. SWIETENIA Jacq. Enum. PL Carib. 4. 1760. 



References: Rolfe. Kew Bull. 1919: 201-207. 1919; Blake, Journ. AVashing- 

 ton Acad. Sci. 10: 286-297. f. 1, 2. 1920. 



Trees with hard and heavy, red wood ; leaves abruptly pinnate or rarely 

 odd-pinnate ; flowers paniculate ; calyx 5-lobed, the lobes semicircular or deltoid : 

 petals 5, oval ; staminal tube 10 toothed, the anthers borne inside the tube at 

 apex ; disk crenulate ; ovary 5-celled ; fruit a capsule, the seeds about 12 in 

 each cell, with a terminal wing. 



The trees of this genus are well known under the name of mahogany, and 

 they are highly valued for their handsome, hard, heavy wood, which is much 

 used for making fine furniture and the interior finish of houses. It should be 

 noted, however, that not all the mahogany of commerce is derived fx'om species 

 of Sicietcnia ; indeed, some of it is obtained from trees which have no rela- 

 tionship with the family Meliaceae. 



' See C. DC. Ann. Cons. Jard. Gen&ve 10: 150. 1907. 



