NORTH AMERICAN FLORA 



[Volume 25 



Stamens more chan twice as many as the petals ; leaves 

 alternate; sepals very unequal, the exterior smallei-. 12. PELTOSTIGMA. 



Fruit samaroid. 



Carpels separating at maturity ; samara winged only on Vae upper 



portion of the back ; flowers usually perfect. 13. Helietta. 



Carpels not separating at maturity ; samara completely surrounded 

 by a wing, or wingless ; flowers polygamous. 

 Samara not woody, completely surrounded by broad wings, the 

 body not reticulate or coarsely so. 

 Trees with simple unbranched trunks ; flowers purplish or 

 scarlet in terminal panicles ; ovary 3-celled (rarely 2-eelled); 

 fruit normally 3-winged ; leaves pinnate. ' 14. Spathelia. 



Branching shrubs or small trees; flowers gree n i sn or yellowish- 

 white in corymbose or panicled cymes; ovary 2-celled (rarely 

 3-celled) ; fruit normally 2-winged ; leaves" digitate. 15. Ptelea. 



Samara nut-like, woody, narrowly wing-mgrgined or marginless, 

 the body thick, not reticulate, but roughened by numerous 

 tuberculate glands. 16. Taravalia. 



Ovules 5 or more in each carpel. 



Ovary 2-celled (rarely 3-celled) ; leaves simple. 17. Thamnosma. 



Ovary 4-celled or 5-celled ; leaves twice o: thrice pinnatelv or ternately 

 divided in the species found in America. 18. Ruta. 



B. Friiit a drupe or berry. 

 Stamens 4-10 ; carpels 1- or 2-seeded. 

 Style lateral or nearly basal. 



Carpels solitary ; style nearly basal. 19. Cneoridium. 



Carpels 5 ; sty.'e centra', attached to the inner faces of the carpels. 20. Sargentia. 

 Style terminal . 



Style obsolete or very short, persistent ; stigma sessile or subsessile. 

 Ovary 2-8-celled. 



Stamens as many as the petals. 21. Casimiroa. 



Stamens twice as many as the petals. 22. Glycosmis. 



Ovary 1 -celled. 



Stamens twice as many as the petals. 23. Amyris. 



Stamens as many as the petals. 24. Stauranthus. 



Style as long as or longer than the ovary, deciduous. 



Stamens 8 or 10 ; calyx 5-fid (rarely 4-fid) or parted ; unarmed. 25. Chalcas. 



Stamens 6 ; calyx 3-lobed (rarely 4-lobed); spiny. 26. Triphasia. 



Stamens 20-60 ; carpels several-seeded. 27. Citrus. 



1. ERYTHROCHITON Nees & Mart. Nova Acta Acad. 



Leop. -Carol. 11 : 151, 165. 1823. 



Pentamorpha Scheidw. Bull. Acad. Brux. 9 1 : 20. 1842. 

 Toxosiphon Baillon, Adansonia 10 : 311. 1872. 



Small trees or shrubs. Flowers perfect. Calyx large, 5-angled or 5-ribbed, unequally 

 5-cleft, the two lower and the three upper lobes more or less connate at first, the lobes 

 separating and becoming nearly distinct in age, long-persistent and surrounding the cap- 

 sule. Petals 5, connate. Corolla-tube straight or curved, cylindric, about equaling the 

 calyx, the lobes subequal, patent, oblong, obtuse, glandular-punctate. Stamens 5, all 

 fertile, or 2 or 3 sterile ; filaments adnate to the tube of the corolla, the tips free ; anthers 

 oblong-linear, erect. Disk thin, cylindric, erect, truncate. Ovary surrounded by the disk, 

 5-lobed, 5-celled; style filiform, straight; stigma capitate or obliquely 5-lobed. Ovules 

 paired in each cell, collateral or superposed. Capsule 5-celled, the carpels scarcely cohering 

 by their sides, 2-valved. Seeds 2 in each carpel, subquadrate or triangular, enclosed in 

 the elastic, horny endocarp, which in drying separates, splits and curls back, ejecting the 

 seeds. Embryo in thin endosperm, curved. Cotyledons plicate-convolute. 



Type species, Erythrochiton brasilicnsis Nees & Mart. 



1. Erythrochiton Lindeni (Baillon) Hemsl. Biol. Centr. Am. 

 Bot. 1 : 166. 1879. 



Toxosiphon Lindeni Baillon, Adansonia 10 : 312. 1872. 



A shrub with glabrous foliage, the robust branches leafy toward the apex ; leaves uni- 

 foliolate, long-petioled, oblong-lanceolate to elliptic or oblanceolate, about 2.5-3.5 dm. 

 long, 8-10 cm. broad, shortly acuminate or abruptly long-acuminate, entire, membranous, 

 minutely pellucid-punctate, the lateral nerves prominent beneath ; petiole terete, 5-10 cm. 

 long ; flowers pedicelled, in small, dense, 2-4-branched, scorpioid cyrnes, on long peduncles ; 



