244 



POMACEAE. 



[VOL. II. 



Crataegus flava Ait. 



12. Crataegus tomentdsa I,. Pear- 

 thorn. Pear Haw. (Fig. 2002.) 



Crataegus lomentosa I,. Sp. PI. 476. 1753. 



A shrub or small tree, sometimes reaching 25 

 in height and a trunk diameter of 18'. Spines 

 stout, i / -2_j4 / long; leaves petioled, broadly oval 

 or ovate-oval, acute or acutish at the apex, nar- 

 rowed or cuneate at the base, sharply dentate or 

 somewhat lobed, not glandular, slightly scabrous 

 above, pubescent, especially along the veins 

 beneath, 2 / -5 / long; corymbs many-flowered; 

 twigs, petioles and calyx tomentose-pubescent; 

 flowers about 6" broad; calyx-lobes lanceolate, 

 usually incised; styles 3-5; fruit dull red, obovoid 

 or globose, about 6" in diameter. 



In thickets, southern Ontario to New Jersey and 

 Georgia, west to Michigan and Missouri. Wood 

 hard, reddish-brown; weight per cubic foot 47 Ibs. 

 May-June. 



Summer or Yellow Haw. (Fig- 20x33.) 



Mespilus hyemalis Walt. Fl. Car. 148. 1788? 

 Crataegus flava Ait. Hort. Kew. a: 169. 1789. 

 C. flava \zr.pubescens A. Gray, Man. Ed. 5, 160. 1867. 

 Crataegus flexispina Sarg. Card. & For. 3: 424. 1889. 

 Not Mespilus flexispina Muench. 1785. 



A tree, with maximum height of about 20 and 

 trunk diameter of i(/, usually very thorny. 

 Leaves obovate, petioled, obtuse or short-pointed 

 and irregularly glandular dentate at the apex, nar- 

 rowed or cuneate and often entire at the base, #'- 

 i#' long, pubescent on both sides or at length 

 glabrate; corymbs few-flowered; pedicels and 

 calyx pubescent; flowers 6"-o // broad; calyx- 

 lobes entire or glandular-serrate; styles commonly 

 5; fruit globose or somewhat pyriform, greenish, 

 yellow or red, 5 "-8" in diameter. 



In'sandy thickets, Virginia to Florida, west to Mis- 

 souri and Texas. April-May. 



14. Crataegus unifldra Muench. Dwarf Thorn. (Fig. 2004.) 



Crataegus uniflora Muench. Hausv. 5: 147. 1770. 

 Crataegus parvifolia Ait. Hort. Kew. 3: 169. 1789. 

 Crataegus tomcntosa Michx. Fl. Bor. Am. i: 289. 1803. 

 Not L. 1753. 



A shrub, 3-8 high or sometimes a small tree. 

 Spines numerous, slender, i / -2 / long; leaves ob- 

 ovate, coriaceous, nearly sessile, obtuse and crenate 

 at the apex, cuneate and entire at the base, ^'-i^' 

 long, more or less pubescent on both surfaces or 

 glabrate and at length shining above; corymbs 1-7- 

 flowered; twigs, pedicels and calyx pubescent; flow- 

 ers 4"-5" broad ; calyx-lobes lanceolate, deeply in- 

 cised, glandular, about equaling the petals; styles 

 commonly 5, fruit globose or pyriform, 5 "-8" in 

 diameter, yellow. 



In sandy soil, southern New York to Florida, west to 

 West Viiginia ar.d Louisiana. April-May. 



