154 MALACEAE. 



Leaf-blades glabrous, at least at maturity : sepals glabrous or nearly so without. 



1. If. gluuceacens. 

 Leaf-blades persistently pubescent, often tomentose beneath : 



sepals pubescent without. 2. M. Malus. 



1. M. glaucescens Rehder. Small tree: leaf -blades sparingly pubescent be- 

 neath along the veins when young, glabrous when old, sharply serrate and often 

 somewhat lobed, rounded or cordate at the base, 2.5-7.5 cm. long: flowers very 

 fragrant: pedicels slender, glabrous: corolla rose-colored, 2.5-5 cm. broad: 

 pome subglobose or depressed, 3-3.5 cm. in diameter, greenish-yellow, fragrant, 

 very acid. — Rather rare, in thickets. — Crab-apple. 



2. M. Malus (L.) Brittou. Tree with sj^reading branches: leaf -blades broadly 

 ovate or oval, obtuse or abruptly pointed 2.5—7.5 cm. long, dentate or nearly 

 entire, often woolly beneath, especially when young: j^edicels generally tomen- 

 tose, stout: corolla pink or white, 3.5-7.5 cm. broad: pome depressed-globose 

 (or elongate in cultivated forms), 5-7.5 cm. in diameter. — Common, in 

 woods and thickets, and on roadsides. — Common-apple. 



3. ARONIA Pers. Leaf -blades simple, shallowly toothed. Cymes com- 

 pound. Pome berry-like, globular to pyriform. — Spr. — Chokeberry. 



Cyme-branches and lower surfaces of the leaf-blades woolly : pomes red. 



1. A. arbutifoUa. 

 Cyme-branches and lower surfaces of the leaf-blades glabrous : 



pomes black or dark-purple. 2. A. melanocarpa. 



1. A. arbutifolia (L. f.) Ell. Shrub, sometimes reaching a height of 3.5 m.: 

 leaf-blades oval, obloug, or obovate, obtuse or abruptly short-pointed, nar- 

 rowed or somewhat cuneate at the base, 2.5-7.5 cm. long, serrulate-crenulate: 

 cymes terminal, but at length overtopped by the young sterile shoots: corolla 

 white or purplish-tinged, 8-12 mm. broad: pomes 4-6 mm. in diameter, long- 

 persistent. — Common, in swamps and low woods. 



2. A. melanocarpa (Michx.) Ell. Shrub resembling the preceding species, but 

 larger, or sometimes a small tree: leaf -blades obovate or oval, obtuse, acute, 

 or abruptly acuminate at the apex, narrowed or cuneate at the base, crenulate : 

 flowers similar to those of the preceding sj^ecies: hypanthium and pedicels 

 nearly glabrous: pomes globose or oval, 6-8 mm. in diameter. — Common, in 

 wet grounds and swamps. 



4. AMEIfANCHIER Medic. Leaf -blades simple, toothed or rarely entire. 

 Cymes simple. Pome berry-like, globular. — Spr. — June-berry. Service- 

 berry. May-cherry. 



Petals elongate (10-18 mm.) : leaf-blades glabrous or nearly so: lower pedicels mostly 



1.5-3 cm. long, becoming 3-5 cm. long at maturity. 1. A. laevis. 



Petals short (7-9 mm.) : leaf -blades densely white-tomentose when 

 young, less densely pubescent in age : lower pedicels 1-2 cm. 

 long or less, becoming 1-2 cm. long at maturity. 

 Leaf-blades with 8-9 pairs (average) of lateral veins : hypan- 

 thium saucer-shaped : ovary woolly on top : sepals recurved 

 when the petals fall. 2. A. stolonifera. 



Leaf-blades with 31-15 pairs (average) of lateral veins : hypan- 

 thium campanulate : ovary mostly glabrous on top: sepals 

 erect when the petals fall. 3. A. ohlongtfoha. 



1. A. laevis Wiegand. Tree becoming 13 m. tall, or sometimes a shrub: leaf- 

 blades ovate, oval, or elliptic, 4-6 cm. long, short-acuminate at the apex, 

 sharply serrate, mostly rounded or subeordate at the base, slender-petioled : 

 hypanthium campanulate: sepals triangular-lanceolate or subulate, 3-4 mm. 

 long, reflexed at the base when the petals fall: petals oblong-linear: ovary 

 glabrous on top: pomes purple or nearly black beneath the bloom, 6-8 mm. in 

 diameter. [A. canadensis of various authors.] — Common in woods and on 

 damp slopes. 



