4 NORTH AMERICAN FLORA [Volum 29 
Pedicels shorter than the calyx. 
Twigs and inflorescence densely long-villous. (Jamaica.) 16. C. Alexendri. 
Twigs and inflorescence short-villous or tomentose. 
Leaves green and nearly or quite glabrous beneath. 
Leaves entire or nearly so. (Cuba.) 17. C. cubensis. 
Leaves sharply dentate. 
Flowers nodding. (Hidalgo.) 18. C, Alcoceri. 
Flowers erect. (Jamaica.) 19. C. bracteata. 
Leaves tomentose beneath. 
Racemes divergent. (Durango.) 20. C. Palmeri. 
Racemes erect or ascending. (Salvador.) 21. C. salvadorensis., 
1. Clethra alnifolia L. Sp. Pl. 396. 1753. 
Clethra alnifolia denudata Ait. Hort. Kew. 2: 73. 1789. 
Clethra paniculata Ait. Hort. Kew. 2: 73. 1789. 
Clethra alnifolia glabella Michx. Fl. Bor. Am. 1: 260. 1803. 
Clethra scabra Pers. Syn. Pl. 1: 483. 1805. 
Cleithra Michauxii Courtois, Mag. Hort. Court.1: 249. 1833. 
Clethra dentata Ait.; DC. Prodr. 7: 588, as synonym. 1839. 
Clethra alnifolia Michauxii Nichols, Kew Handl. Arb. 2: 67. 1896. 
Clethra alnifolia paniculata Nichols. Kew Handl. Arb. 2:67. 1896. 
Clethra alnifolia scabra Nichols. Kew Hand}. Arb. 2:67. 1896. 
Clethra alnifolia {. rosea Rehder, Mitt, Deuts. Dendr. Ges. 16: 75. 1907. 
A shrub 1-3 m. tall, with erect or ascending branches and sparingly pubescent twigs. 
Leaves obovate or cuneate, 3-8 cm. long, usually acute or short-acuminate at the apex, sharply 
serrate, at least above the middle, glabrous or nearly so on both sides, short-petioled; racemes 
erect, canescent, 5-15 cm. long, simple or paniculately branched; pedicels 1-3 mm. long, 
erect or up-cttrved after flowering, subtended by narrow bracts; calyx-segments oblong or 
oblong-lanceolate, 2—2.5 mm. long, obtuse or sometimes acute, longitudinally ridged in age; 
corolla white, 8-9 mm. broad; petals oblong or cuneate-oblong, 5-6 mm. broad, hooded and 
often notched at the apex; filaments glabrous; style glabrous or pubescent; capsule sub- 
globose, about 3 mm. in diameter, erect or ascending. 
TYPE Locality: Carolina. , 
DistRIBUTION: Maine to Pennsylvania, Florida, and Mississippi. 
InLustRaTiIons: Pluk. Alm. #1. 115, f. 1; Catesby, Nat. Hist. Car. 1: pl. 66; Lam. Tab. Encyc. 
pl. 369; Gaertn. Fruct. pl. 63; Schkuhr, Handb. pl. 118; Goodale, Wild Fl. Am. pl. 22; Britt. & 
Brown, Ill. Fl. f. 2724; ed. 2. f. 3195. 
2. Clethra tomentosa Lam. Encyc. 2:46. 1786. 
Clethra alnifolia pubescens Ait. Hort. Kew. 2: 73. 1789. 
Clethra alnifolia tomentosa Michx, Fl. Bor. Am. 1: 260. 1803. 
Clethra incana Pers. Syn. Pl. 1: 483. 1805. 
Clethra pubescens Willd. Enum. 455. 1809. 
A shrub 1-3 m. tall, with tomentose foliage, the branches erect or ascending. Leaves 
obovate, narrowly or broadly cuneate, 4-10 cm. long, acute or acuminate, serrate, more or less 
pubescent above, densely white-tomentose beneath, short-petioled; racemes solitary or 
several, 6-15 cm. long; pedicels 2-5 mm. long, shorter than the narrow subtending bracts, 
ascending in fruit; calyx-segments ovate or ovate-oblong, 3-3.5 mm. long, slightly ridged 
in age; petals white, spatulate or oblong-spatulate, 5-6 mm. long, concave above; filaments 
glabrous or nearly so; style pubescent; capsule depressed-globose, 4-4.5 mm. broad. 
Typr LocaLity: Cultivated. 
DistRIBUTION: North Carolina to Florida and Alabama. 
ILLUSTRATIONS: Bot. Mag. pl. 3743; Wats. Dendr. #1. 39. 
3. Clethra acuminata Michx. Fl. Bor. Am. 1: 260. 1803. 
Clethra acuminata (glauca) Pers. Syn. Pl. 1: 483. 1805. 
Clethra montana Loisel. Nouv. Duham. 5: 130. 1811. 
Clethra glauca Pers.; Steud. Nom. Bot. Phan. 1: 207, as synonym. 1821. 
A shrub, or a small tree, with a maximum height of 6 m., the branches erect or rarely 
spreading. Leaves mostly crowded near the ends of branchlets, ovate to elliptic, 10-20 cm. 
long, acuminate at the apex, finely serrate except the cuneate or rounded base, deep-green 
above, paler and more or less pubescent, at least on the nerves, beneath, short-petioled; racemes 
5-20 cm. long, usually solitary, densely pubescent; pedicels 3-8 mm. long; flowers secund; 
