330 Order 41 ROSACEA. 



acuminate or cuspidate or mucronate, sharply serrate, smooth ; rac. loose, elon- 

 gated ; segm. of the caL triangular-lanceolate, nearly as long as the tube ; petals 

 linear-oblong or oblanceolate ; fr. purplish, globoua. — A small tree or shrub, 

 found in woods, TJ. S. and Brit. Am., rarely exceeding 35f in height. Lvs. 

 2 , to 3' long, downy-tomentous when young, at length very smooth on both 

 sides, very acute and finely serrate. Fls. large, white, in terminal racemes, ap- 

 pearing in early spring, rendering the tree quite conspicuous in the yet naked 

 forest. Fruit pleasant to the taste, ripening in June. (Pyrus Botryapinm L. f.) 



p., OBLONGiFoLiA T. &. Gr. Shrubby; lvs. oblong-oval, mucronate, and with 

 ^ small, sharp serratures; rao. and flowers smaller; pet. oblong-obovate, 

 thrice longer than the calyx. (A. ovalis Hook.) 



y. EOTUNDiFoLiA T. &. G. Lvs. broad-oval; petals h'near-oblongi Shrub 10 

 . to 2 Of high. (Pyrus ovalis Willd.) 



d. ALNiFoLLi T. & G. Shrubby or arborescent ; lvs. orbicular-oval, rounded or 

 retuse at each end, serrate only near the apex ; pet. linear-oblong ; stam. 

 very short. (Aronia alnifolia N"utt.) 



c. 0LI600JEPA T. & G. Shrubby ; lvs. mostly glabrous from the first, eUiptic- 

 oblong, cuspidate; rac. 2 to i-flowered, pet. obovate-oblong. — Mountain 

 swamps, N. H., ISf. T. and northward. 



12. CRAT^'GUS, L. Thorn. Ha-wthoeit. (Gr. Kpdroq, strength ; 

 on acconnt of the firmness of the wood.) Calyx urceolate, limb S-cleft ; 

 petals 5; stamens oo; ovaries 1 to 5, with as many styles; pome 

 fleshy, containing 1 to ^ bony, 1-seeded carpels, and crowned at the 

 summit by the persistent calyx and disk. — Trees or shrubs, armed with 

 thorns. Lvs. simple, often lobed. Bracts subulate, deciduous, mostly 

 glandular. Fls. corymbou.s. 



§ Corymbs 6 to 80-floweretl, appearing with the leaves, (a) 



a Viilousor pubescent, Lvs. plicate or sulcate along the veins Nos. 3,2 



a Pubescent. Lvs. plain, not at all plicate, cleft ornot Nos. 8, 4 



a Glabrous throughout.— Lvs. abrupt at base, lobed, petioled Nos. 6—7 



—Lvs. attenuate at base, seldom lobed Nos. 8, 9 



§ Corymbs t to 6-flowered, — appearing before the downy leaves * No. 10 



—appearing with the leaves,— pubescent !.!!".'.!!!! No. 11 



—glabrous Nos. 12, IS 



1 C tomentosa L. Black Thorn'. Lvs. broad-ovaie or ovcd, abrupt at base, the 

 margin doubly and sharply serrate or cut into many smaU lobes, villous or pubescent 

 when young as well as the petioles and compound corymbs of large fls., veins 

 prominent beneath, sulcate above; fruit rather large (8 to 9" diam.) oval or 

 globular, 5-carpeled, 2 to 5-seeded, crimson, tinged yellowish.— Can. to Ey. and 

 Car. iifts. A large shrub or tree 15 to 25f high. Lvs. half grown with the hand- 

 some white fls., finally 2 to 3' by 1 to 2'. Fl. Apr., Jilay. Fr. JI. Aug, 



/3. PLIOATA. Lvs. smaller, nearly glabrous and strongly plicate. Vt. (T.'&G.), 

 N. H. and IST. T. ' . ■ 



7. PYEiroLiA Ait. Lvs. ovate-elliptic or oval, acute at base, and with the 

 slender petioles and corymbs thinly pubescent, phcate, sharply toothed and 

 slightly cut-lobed. Styles mostly 3. — Mich, to Iowa. 



d. PLABEiLATA Bosc. -Lvs. roundish-ouneiform or somewhat fanehaped, 

 glabrous, dentate and cut-lobed above ; corymbs and bracts pubescent, glan- 

 dnlar. — III., Iowa. 



c. MOLLIS Gray. Lvs. large, softly villous, subcordale, with the margin quite 

 oouspicuously, many (9 to ]3)-lobed; corymbs canescently Villous; fruit 

 downy when young. — Ohio to Iowa. 



2 C. punctata Jaoq. Lvs. cuneiform-obovaie, doubly and often incisely serrate, 

 entire atbase, and narrowed to a short, winged petiole, veins straight and prominent, 

 pubescent beneath; corymbs and cal. villous-pubescent ; sty. 3 (1 or 2); fr. 

 globous, punctate.— -BordeTS of woods, U. S. and Can. Tree 12 to 25f high. 

 Brandies wide-spreading, crooked, covered with cinerous bark. Thorns stout, 

 sharp, 1 to 2' long, sometimes wanting. Lvs. IJ to 2J' long, 1 as wide, acute or 

 short acummate ; petioles J to 1' long. Fls. white, in somewhat leafy, compound 

 corymbs of 8 to 15. Fr. 5 to 8 ' diam., red or yeUowish, eatable in Sept. Fls. 

 Apr.— Jn. 



