Part 3, 1911] RITACKAE 219 



9. Amyris madrensis S. Wats. Proc. Am. Acad. 25: 144. 1890. 



A densely leafy shrub with pubescent twigs and foliage ; leaves opposite ; leaflets 5- 

 11, petioled, leathery, ovate or rhombic-ovate, 1.5-3 cm. long, 7-20 mm. broad, obtuse or 

 retuse at the apex, cuneateat the base, crenate or entire, dark-green, lustrous and pubes- 

 cent with scattered hairs or glabrous above, paler and tomentulose beneath, petioluled ; 

 panicles lateral in the axils of the upper leaves ; calyx tomentulose ; petals obovate or 

 obovate-cuneate, 2.5-3 mm. long, 1.5-2 mm. broad; anthers ovate or orbicular; ovary 

 ovoid, pilose, stigma capitate, sessile ; drupe obovoid or ellipsoid, 10-12 mm. long, 7-8 

 mm. broad, sparingly pubescent or glabrous. 



Type locality : Limestone ledges, mountains near Monterey, Nuevo Leon. 

 Distribution: Northeastern Mexico and adjacent Texas. 



10. Amyris texana (Buckley) P. Wilson, Torreya 8 : 139. 1908. 



Zanthoxylum texanum Buckley, Bull. Torrey Club 10: 90. 1883. 

 Amyris parvifolia A. Gray, Proc. Am. Acad. 23: 226. 1888. 



A glabrous aromatic shrub, 1-2 m. tall, the twigs, petioles and inflorescence densely 

 glandular ; leaves alternate, 3-foliolate, short-petioled ; leaflets somewhat leathery, ovate, 

 narrowly ovate or rhombic-ovate, 1-3 cm. long, 5-15 mm. broad, obtuse or retuse at the 

 apex, rounded, subtruncate, or cuneate at the base, irregularly and coarsely or doubly 

 crenate, short-petioluled or subsessile ; flowers in terminal corymbose panicles ; calyx 1 mm. 

 broad ; sepals broadly ovate or broadly triangular ; petals oval or obovate, 2.5-3 mm. long, 

 1.5-2 mm. broad ; anthers oval or orbicular ; ovary ovoid or ovoid-oblong ; stigma capitate 

 sessile ; fruit not seen. 



Type locality: Near Corpus Christi, Texas. 

 Distribution : Texas and adjacent Mexico. 



11. Amyris sylvatica Jacq. Sel. Am. Hist. 107. 1763. 



Amyris Plumieri DC. Prodr. 2: SI. 1825. 



Amyris sylvatica Plumieri Maza, Anal. Soc. Esp. Hist. Nat. 19: 229. 1890. 



Blemifera Plumieri Kuntze, Rev. Gen. 100. 1891. 



Elemifera sylvatica Kuntze, Rev. Gen. 100. 1891. 



An evergreen shrub or small tree, 2-6 m. tall ; leaves alternate or occasionally suboppo- 

 site, 3-foliolate, or rarely 5-foliolate, petioled; leaflets ovate to rhombic-ovate, rarely some- 

 what orbicular, rather thin, the lateral ones 3-10 cm. long, 2-9 cm. broad, acute, acuminate, 

 or sometimes rounded at theapex, broadly cuneate or rounded at the base, glabrous, crenate 

 or doubly crenate, petioluled ; flowers in terminal panicles ; calyx glabrous ; sepals triangular 

 or oval; petals oval, ovate, or spatulate, about 3 mm. long and 2 mm. broad, rounded or 

 somewhat pointed at the apex ; anthers oval or ovate ; ovary ovoid-oblong or linear-oblong, 

 glabrous, somewhat contracted at the base ; style short ; stigma capitate ; drupe globose or 

 globose-pyriform, 4.5-7 mm. in diameter, black or reddish. 



Type locality : Cartagena, Colombia. 



Distribution : Jamaica, Hispaniola, Mexico, and Costa Rica ; also in northern South America. 

 Illustrations: Plum. PI. Am. pi. 100; Karst. Fl. Columb. pi. 15S,f.3 ; Baillon, Hist. PI. 4 : 

 397, /. 447-451. 



12. Amyris thyrsiflora Turcz. Bull. Soc. Nat. Mosc. 31 1 : 475. 1858. 



Elemifera thyrsiflora Kuntze, Rev. Gen. 100. 1891. 



A glabrous shrub or tree with usually distinctly winged petioles, or wings occasionally 

 obscure ; leaves alternate, 3-foliolate, the leaflets oblong-elliptic to rhombic-elliptic, 4-10 

 cm. long, 2-5 cm. broad, obtuse to acuminate at the apex, obtuse or cuneateat the base, 

 crenate or nearly entire, short-petioluled or subsessile; inflorescence axillary and terminal ; 

 flowers fragrant ; petals obovate, 3-3.2 mm. long, 1.7-2 mm. broad ; anthers ovate ; ovary 

 glabrous, oblong or ellipsoid, gradually tapering into a short style ; stigma capitate. 



Type locality : State of Vera Cruz. 

 Distribution : Mexico. 



Doubtful and excluded species 

 Amyris ariensis (H.B.K.) Spreng. Syst. 4 : Cur. Post. 149 (1827), is Elaphrium int- 

 ense H.B.K. 



