108 POMACEAE 



Flowers pink. 1. Malus. 

 Flowers white. 



Flowers appearing before leaves. 2. Amelanchiee. 



Flowers appearing after leaves. 3. Crataegus. 



1. MALUS Mill. Wild Crab Apple. 

 Trees with showy cyniose flowers. Cells of the ovary each 2-ovaled. 

 Pome globose, hollowed at the base and apex. 



Leaves nearly glabrous beneath. 1, 31. coronaria. 



Leaves tomentose beneath. 2. 31. loensis. 



1. M. coronaria (L. ) Mill. A small tree with ovate, serrate leaves, 

 which are rounded at the base: pome about V in diameter. — In woods, 

 especially in the northern part. Not common. April. 



2. M. loensis (Wood) Britton. Differs from the last in having its 

 leaves hairy beneath and narrowed at the base, and pubescent calyx and 

 pedicels. — Often common in woods. April. 



2. AMELANCHIER Medic. 

 Small trees with white racemose flowers. Styles 2-5. Cells of ovary 

 twice as many as the styles, each 1-seeded. Pome berry-like. 



1. A. Canadensis (L.) Medic. Service Berry. Leaves ovate-ob- 

 long, acute, cordate at base, sharply serrate, sparingly pubescent below, 

 2''-4' long : racemes several-flowered, the bracts silky-pubescent and de- 

 ciduous : petals linear-spatulate. — Rocky woods chiefly in the northern 

 part. Not common. March-April. 



3. CRATAEGUS L. Eed Haw. 



Small trees with terminal corymbose white flowers. Styles 1-5. 

 Ovary 1-5-celled, containing as many bony ovules. 



Leaves simply serrate. 1. C. Orus-Galli, 

 Leaves doubly serrate. 



Leaves glabrous beneath. 2. C. 3fackenzii. 

 Leaves pubescent beneath. 



Petioles 5''^ or less long. 3. C. pertomentosa. 



Petioles 5^^ or more long. 4. C. viollis. 



•^ 1. C. Crus-Galli L. 5°-20° high, glabrous throughout : leaves oblong- 

 spatulate, 12''-20'^ long, obtuse, simply serrate, strongly tapering at base 

 to petioles 3'^ or less long : fruit lurid-red, 4'''-5'^ wide. — Common in 

 barrens and occasional in low grounds. A form with villous fruiting 

 cymes, twigs and petioles and lower leaf surface pubescent, which may be 

 distinct, occurs near Sni Mill. May. 



2. C. Mackenzii Sargent n. sp. 5°-20° high, glabrous throughout : 

 leaves ovate-orbicular, V-2^ long, acute, sharply double-serrate, truncate 

 or subcordate at base : petioles ^''-X^X" long : fruit lurid-red, h"-%" 

 wide. — Barrens throughout but uncommon. May. 



3. C. pertomentosa Ashe. 5°-20° high: leaves broadly ovate, l.r-2}' 

 long, 9"- 18" wide, pubescent beneath, doubly serrate, rounded or taper- 



