Bursera BUESERACE.-E 205 



FAMILY XLVII. BURSERACE^E. 



Trees or shrubs. Leaves alternate, without stipules, simple 

 or imparipinnate ; leaflets opposite. Flowers racemose or pani- 

 culate, hermaphrodite or polygamo-dioecious. Calyx 3-6-lobed. 

 Petals 3-6, deciduous. Disk free or adnate with the tube of the 

 calyx. Stamens generally twice as many as the petals, inserted 

 on the disk. Ovary 2-5-celled. Ovules 2 in each cell, attached 

 near the apex at the interior angle of the cell. Fruit drupaceous. 

 Seeds without endosperm. Cotyledons contortuplicate ; radicle 

 superior. 



Species 400 or more, natives of the tropics. 



Ovary 3-celled ; stigma 3-lobed 1. Bursera. 



Ovary 4-5-celled ; stigma 4-5-lobed 2. Protium. 



\. BURSERA L. 



Trees with balsamic resinous juices. Leaves compound or 

 simple. Flowers small, polygamous, in lateral panicles or 

 racemes, sometimes clustered. Calyx small, with 3-6 lobes. 

 Petals 36, valvate. Stamens twice as many as the petals, 

 inserted at the base of the annular disk. Ovary 3-celled ; style 

 very short ; stigma obtusely 3-lobed. Drupe indistinctly 

 3-angled ; epicarp leathery-fleshy, resinous, separating into three 

 valves ; stone usually solitary, bony, triangular, united to a 

 persistent fleshy axis, 1 -celled, 1 -seeded. 



Species 100, natives of the tropics, chiefly America. 



Leaves compound. 



Leaflets papery. Bark flaking off 1. B. Simaruba. 



Leaflets leathery. Bark persistent 2. B. Hollickii. 



Leaves simple 3 . B. simplicifolia. 



1. B. Simaruba Sarg. Gard. d- For. Hi. 260 (1890); leaves 

 compound ; leaflets papery ; bark flaking off. Sara. Sih\ i. 97, 

 t. 41, 42; Encjl. in Enyl-Prantl Pflzfam. Hi. pt, 4, 249, /. 145; 

 Urb. Symb. Ant. iv. 324. Bursera gummifera L. Sp. PI. c<l. -, 

 471 (1762); Jacq. Set. Stirp. Amer. 94, t. 65 (Burseria) A: Ed. 

 j.ict. t. 96; Sw. Obs. Bot. 131 ; Wright Mem. 193 ; M<-f. Jam. i. 

 229 ; Gri-l,. FL Br. W. Ind. 173 ; Baill Hist. v. 261, /. 269-274 ; 

 Engl. in DC. Mon. iv. 39, t. i, /. 33-39 ; Conk <t- Clt. in <',,,,trib. 

 U.S. Nat. Herb. viii. 97, /. 21. Betula arbor Americana <fec, 

 Pliik. Plnjt. t. 151, f. 1. Terebinthus major betulte cVc. Sloan* 

 Cat. 167 it Hist. ii. 89, t. 199. T. foliis cordato-ovatis <kc. Browne 

 Hist. Jam. 345. T. Brownei Jacq. Enn,,,. PI. Carib. 18 (1760). 

 T. simaruba W. F. HV//// ex !!<>*> in <'ntr!l>. U.S. Nat. Herb. x. 



