90 Schuette — Hawthorns of Northeastern Wisconsin. 



globose or globular, red. Thorns generally short and stout, straight, 

 dark brown and shining, gray on older branches. Flowering toward the 

 end of May. Not rare on rich and moist soil. 



6. Crataegus pyrifolia sylvestris subsp. nov. 



This plant, probably a woods-living form, is closely allied to the last. 

 It is, however, distinguished by having usually 10 (7-12) stamens; anthers 

 white becoming yellow, then brown; the sepals outside glabrous or near- 

 ly so, in general less hairy on the corymb; bracts narrowly lanceolate to 

 linear or filiform; the petioles slightly longer, often one-fourth as long 

 as the blade; the upper involucral leaves sometimes uniform whitish or 

 approaching the last with greenish or yellowish margins, usually slender, 

 longer, often bent, numerous on shrubs, fewer on trees. A slender tree 

 (8-15 feet high) with slender branches, occurring not rarely in wet, moist, 

 shady woods. Flowering with the last. Type specimen, No. 431,500, 

 U. S. National Herbarium. 



7. Crataegus caliciglabra sp. nov. 



A low, spreading, thorny shrub on borders of open fields and in groves, 

 similar in general to No. 3, but distinguished by the following characters: 

 shoots of the current year glabrous; calyx, except the upper side of the 

 sepals absolutely glabrous; the whole plant otherwise glabrous; the peti- 

 ole obviously marked with 3-5 glands; the uppermost involucral leaves 

 green with a reddish midnerve, spatulate; the lanceolate, slender sepals 

 usually longer than the cup when flowering. This species is distinguished 

 from C. pyrifolia and C. cocci/iea by its white anthers and the more obtuse 

 teeth of the blade. Flowering with the last. Type specimen, No. 431, 49S, 

 U. S. National Herbarium. 



8. Crataegus coccinea L. 



A polymorphous shrub, nearly every individual exhibiting some vari- 

 ation. The young plants vary from the old ones, the solitary individuals 

 from those in groups. According to the environment characters disap- 

 pear, are added, or fail to present a distinct appearance. For these rea- 

 sons the following description includes several forms recently regarded 

 as species. 



The typical form is only a shrub, 3 to 10 feet high. The branches are 

 gray, ascending, more or less divergent, roundish, striate or irregularly 

 angular, and somewhat undulately-bent; the twigs yellowish or brown- 

 ish; the fertile shoots of the season glabrous; the thorns short and stout 

 or long and slender, brown (gray on old twigs), mostly black at top and 

 brown-red below, sometimes with a slightly silver-gray cover; petioles 



