MALACEAE. 155 



2. A. stolonifera Wiegand. Shrub mostly 1 ni. tall or less, often growing in 

 patches: leaf-blades oval, varying sometimes to oval or suborbieular, 2.5-5 cm. 

 long, rounded or acutish at the apex, finely serrate, rounded or rarely sub- 

 cordate at the base, slender-petioled : hypanthium saucer-shaped: sepals tri- 

 angular-lanceolate, 2.5-3 mm. long, recurved from the middle when the petals 

 fall: petals oblong-obovate: ovary woolly on top: pomes purplish-black be- 

 neath the bloom, 6-7 mm. in diameter. [A. spicata of various authors.] — S. 

 Lower Susquehanna valley. Eare, on rocks or dry banks. — Schists. 



3. A. oblongifolia (T. & G.) Koemer. Shrub 8 m. tall or less, often growing 

 in clumps : leaf-blades oblong, elliptic-oblong or narrowly obovate-oblong, 3-5.5 

 cm. long, rounded or acutish at the apex, very finely serrate, rounded or rarely 

 subcordate at the base ; rather slender-petioled : hypanthium campanulate : 

 sepals triangular, 1.5-2.5 mm. long, erect or irregularly spreading: petals 

 oblong-obovate to oblanceolate or linear: ovary mostly glabrous on top: 

 pomes nearly black beneath the bloom, 5-7 mm. in diameter. [A. Botryapium 

 of various authors.]- — ^S. Occasional, in low or rocky woods. — Schists. 



5. CRATAEGUS L. Small trees or shrubs, usually armed with thorns or 

 spines. Leaves alternate : blades simple, petioled. Flowers terminal, cymose 

 or corymbose. Hypanthium cup-shaped or campanulate, adnate to the carpels. 

 Sepals 5, reflexed after anthesis. Corolla white or pink. Petals 5, spreading, 

 rounded, inserted on the margin of the disk in the throat of the hypanthium. 

 Stamens 5-25, inserted in 1-3 rows on the edge of the hypanthium: filaments 

 slender, incurved: anthers oblong or suborbieular, white, yellow, pink, or 

 purple. Ovary inferior, or its summit free, composed of 1-5 carpels: styles 

 1-5, not united, persistent : stigmas terminal. Pome globose, pyriform, or 

 oval, yellow, orange-red, blue, or black, containing 1-5 bony carpels, each 

 usually 1-seeded. Seed erect, the testa membranous. — Spr. ■ — Haw. White- 

 thorn. Haavthoen. 



Leaf-blades deeply lobed : sepals obtuse. ' 1. C Oxyacantha. 



Leaf-blades toothed and often also shallowly lobed : sepals acute 

 or acuminate. 

 Sepals entire. 



Sepals short : leaf-blades of a deltoid type : pomes less 



than 7 mm. thick. 2. C. Phacnopyrum. 



Sepals long : leaf-blades not of a deltoid type : pomes 



over 7 mm. thick. 3. C. Crus-galH. 



Sepals toothed. 



Flowers few in each corymb. 



Sepals shallowly toothed, not foliaceous : stamens 



about 10. 4. C. coccinea. 



Sepals laciniate-toothed, foliaceous : stamens typically 



20. 5. C. tomcntosa. 



Flowers many in each corymb. 



Corolla about 2 cm. wide : anthers yellow : pomes red. 6. G. rotundifoUa. 

 Corolla about 1.5 cm. wide : anthers red : pomes 



crimson. 7. C. Holmesiana. 



1. C. Oxyacantha L. Tree sometimes 9 m. tall, or a shrub, the thorns short: 

 leaf -blades ovate in outline, 1-4 em. long, serrate and 3-15-lobed, acute, deep- 

 green and ultimately glabrous above, paler and persistently pubescent beneath, 

 cuneate to truncate at the base: corymbs many-flowered, the branches glabrous: 

 sepals deltoid, 1-1.5 mm. long, entire, obtuse: corolla 13-16 mm. wide: stamens 

 about 20; anthers pink: ponies globose or subglobose, 6-8 mm. thick, red. — 

 Occasional, in thickets and on roadsides. Nat. of Eu. — English-hawthorn. 



2. C. Phaenopyrum (L. f.) Medic. Tree sometimes in m. tall, or more often 

 a shrub with nearly erect and spreading branches, the thorns rather long: 

 leaf -blades of a deltoid type, broadly ovate or ovate-triangular, 2-8 cm. long, 

 acute, serrate and incised or 3-7-lobed, glabrous, truncate or cordate at the 



