Part 3, 1911] SIMAROUBACEAE 233 



1. Holacantha Emory i A. Gray, Mem. Am. Acad. II. 5: 310. 1854. 

 A rigid much-branched shrub, 2-3 m. tall, the young parts canescent, the branchlets 

 terete, 5-12 cm. long. Leaves in seedlings 1-1.2 cm. long, the blades linear or lanceolate, 

 thickish, entire or repand or with a pair of basal lobes, in mature plants mostly reduced to 

 small ovate or subulate scales ; flowers subsessile ; staminate flowers 6-7 mm. in diameter, 

 the sepals triangular-ovate, united at the base, canescent, the petals with oblong to some- 

 what ovate, or obovate blades, canescent ; filaments villous below the middle ; anthers oblong 

 or ovate-oblong ; pistillate flowers smaller than the staminate, the sepals ovate or triangular- 

 ovate, 2-2.5 mm. long, canescent ; petals elliptic to narrowly ovate or somewhat obovate ; 

 drupes compressed-ovoid, 6.5-8.5 mm. long, 5-6 mm. broad, sessile. 



Type locality : On the desert between the Gila River and Tucson [Arizona] . 

 Distribution : Arizona and adjacent Sonora. 

 Illustrations : Bot. lies. Bound. Surv. 2 : pi. S. 



7. AESCHRION Veil. Fl. Flum. 58. 1827. 



Picraena Lindl. Fl. Med. 208. 1838. 



Trees with spreading branches. Leaves alternate; blades pinnately compound, the 

 leaflets few or several, opposite, the blades rather broad, entire or rarely toothed, short- 

 petioluled. Flowers polygamous, numerous in peduncled corymbs. Sepals 4 or 5, short, 

 broad, nearly distinct. Petals 4 or 5, much longer than the calyx, those of the pistillate 

 flowers larger than those of the staminate, distinct. Stamens 4 or 5, longer than the petals 

 in the staminate flowers ; filaments rather slender, pubescent ; anthers short. Ovary 2-5- 

 lobed, the carpel-bodies distinct ; styles more or less united, often short. Stigmas introrse. 

 Ovule solitary in each carpel. Drupes solitary or 2-5 together, globose or nearly so or 

 somewhat obovold. 



Type species, Quassia excelsa Sw. 



Staminate corollas 3-4 mtn. wide ; drupes less than 8 mm. in diameter ; leaflet- 

 blades acute at the base. 1. A . excelsa. 



Staminate corollas 6-7 mm. wide ; drupes over 1 cm. in diameter ; leaflet-blades 

 obtuse or rounded at the base. 2. A . antillana. 



1. Aeschrion excelsa (Sw.) Kuntze, Rev. Gen. 103. 1891. 



Quassia excelsa Sw. Prodr. 67. 1788. 



Simarouba excelsa DC. Ann. Mus. Paris 17 : 424. 1811. 



Picraena excelsa Lindl. Fl. Med. 208. 1838. 



Picrasma excelsa Planch. Lond. Jour. Bot. 5 : 574. 1846. 



Aeschrion excelsa microcarpa Krug & Urban; Urban, Bot. Jahrb. 15: 306. 1893. 



A tree commonly 12 m. tall with minutely pubescent twigs. Leaves mostly 1.5-3.5 

 dm. long, the rachis finely pubescent, the leaflets 9-13, the blades oblong, elliptic, lanceo- 

 late or ovate-oblong and 5-12 cm. long, or ovate and 2-5 cm. long on the lower part of the 

 rachis, usually somewhat acuminate but obtuse, minutely pubescent, especially on the veins 

 beneath, acute at the base; corymbs long-peduncled ; sepals ovate, 1 mm. long or less, 

 pubescent ; petals oblong or nearly so, those of the staminate flowers 1.5-2 mm. long, those 

 of the pistillate flowers about 3 mm. long; drupes globose or obovoid-globose, 5-7.5 mm. 

 in diameter, black. 



Type locality : Jamaica. 



Distribution : Jamaica and Santo Domingo. 



Illustration : T. Nees, PI. Off. pi. 3S1 ; Bentley & Trimen, Med. PI. 1 : pi. 57. 



2. Aeschrion antillana (Eggers) Small. 



Rhus anlillana Eggers, Bull. U. S. Nat. Mus. 13 : 41. 1879. 

 Picrasma antillana Urban. Symb. Ant. 5 : 378. 1908. 



A tree 7 m. tall or more with minutely pubescent twigs. Leaves mostly 2-4 dm. long, 

 the rachis sparingly fine-pubescent, the leaflets 7-13, the blades oblong or ovate-oblong 

 and 6-18 cm. long, or ovate and smaller on the lo%ver part of the rachis, somewhat acuminate 

 but obtuse, sparingly fine-pubescent especially on the veins, obtuse or rounded at the base; 

 corymbs short-peduncled, at least during anthesis ; sepals ovate or oblong-ovate, fully 1 



