1S4 RUTACB^. 



LXVIII. ZYGOPHYLLEiE. 



Sepah distinct. Petals mostly imbricative. Stamens 2 (-1) -seriate, distract. Pistil 

 syncarpous : styles combined. Emhty)) straight, with the cotyledons plane: albumeii 

 corneous or none. — Leaves stipulate, usnaily componnd and opposite, devoid of pellucid 

 dots. 



The celebrated alterative gum-resin, Guajacura, is obtained from the wood of both the 

 West Indian species of the genus so called ; this wood, named Lignum Vitts, is very hard 

 and heavy, its specific gravity being 1'3. 



1. TRIBTJLXJS, £. 



Sepals 5 (-6). Stamens 10 (-5). Pericarp 5-10(-13)-co,ceons : carpids indehiscent, 

 tuhercled or spinose. Embryo ezalbuminous. — Herbs; leaves abruptly pinnate, opposite. 



Sect. 1. EuTRiBULDS. — Oalyx deciduous. Varpids 5, divided internally by transverse 

 dissepiments into \-seeded compartments. 



1. T. cistoides, Z. Perennial ; leailets 8(-3)-jugal, silky beneath, shortly oblong ; 

 peduncles as long as the leaf, 1 -flowered ; sepals lanceolate, acuminate, half as long as the 

 petals ; stamens 10 ; carpids 5-8-seeded, leaving by their separation no central axis, 

 tubercled, and 3-1-spinose; spines divergent. — As. Gr. Gen. 2. t. 145 ; Ilesc. PI. 4. t. 250, 

 — ^Petals yellow, 8"'-10"' long, imbricative. — Hab. Jamaica !, Disi., common in the sontherq 

 salt-pastures ; [tropical seashores of all continents, Florida, Texas, Cuba !, and Mexico to 

 Venezuela !, Cape Verde Islands I, Mozambique 1, East Indies !, Sandwich Islands !, Gala- 

 pagos!]. 



Sect. 2. 'KjJui.svRtEm.k.-~CaJyx persistent. Carpids 10 (^12), separating from the 

 central axis, 1-seeded. 



2. T. maximus, X. Annual, suffrutescent, prostrate; leaflets 3-4(-3)-jugal, hairy 

 beneath, obliciuely oblong or oval : stipules lanceolate-linear ; peduncles nearly as long a^ 

 the leaf; sepals subulate, a little exceeded by the petals; stamens 10; carpids keeled, 



' tubercled, unarmed.— «. t. 132. /. 1 ; Sr. Jam. t. 21. /. 3 ; Js. Gr. Qen. 2. t. 146.— 

 ' T. decolor, Macf. I KaUstrcemia, Torr. et Or. — Petals pale-tawny, 2"'-3"' long ; twisted. — 



Hab. Jamaica I, Dist., Al., common in pastures ; S. Vincent I, Guild. ,• [Texas !, California !, 



Mexico 1, Panama I], 



2. GUAJA.CUM, Z. 



Sepals^. Stamens W: anthers recurved. Owry stipitate ; cells 8-10-ovnlate. PenV 

 tarp somewhat fleshy, 5-2-cellcd, tardily septicidal: cells 1-seeded by abortion, compressed 

 and keeled. Embryo included within a rimose albumen. — Ti-ees or shrubs ; leaves abruptly 

 pinnate, opposite, coriaceous, glabrous ; peduncles 1-3, terminal, i-Jlowered; petals blue. 



3. G. officinale, L. Leaflets %-jugal, obovate or oval, blunt ; sepals oval, pubescent, 

 3 times exceeded by the petals ; fruit obovate-roundish, retuse. — SI. t. 222./, 3-6 ; Tuss. PI. 

 4. <. 35 ; Sesc. Fl. 7. t. 463.— A middle-sized or low tree ; leaflets 12"'-6'" long, evergreen ; 

 petals spathulate, 6'" long. — ^Hab. Jamaica!, Matf., Fd., AL, March, in the arid southern 

 plains, to Trinidad !, Lockh. ; [Cuba to Venezuela !]. 



4. G. sanctum, L. Leaflets h-^^ugal, obliquely lanceolate-elliptical, or obovate, 

 jointed or blunt; sepals oval, glabrous, half as long as the petals; fruit obovate-roundish, 

 inucronate. — Commel. Ht. t. 88 ; As. 0r. Gen. 2. t. 148. — G. verticale, Itich. Cub. — 

 leaflets 12"'-8"' long; petals obovate, 6'" long. — Hab. Bahamas !, Swamj. ; [Key-West, 

 Cuba, Haiti I, Portorico]. 



XLIX. EUTACE^. 

 (Diosmese, Zanthoxylem, Simarubese.) 

 Stamens \i.sas&^ 2-1 -seriate. Pistil syncarpous, with the ovaries usually distinct above : 

 ovules 2 (1 -several) in each cell. Pericarp capsular and mostly divided into distinct, follicular 



