THE GENUS CRATAEGUS IN COLORADO 43 
8. C. newberryi Ckll. (flavescens Newberry, 1883, not Bosc or Steud.). Reported from 
the Miocene of Florissant. 
9. C. antiqua Heer. Denver group, Golden. 
to. C. betulefolia Lx. Denver group, Golden. 
11. C. engelhardti Lx. Denver group, Golden. 
12. C. holmesii Lx. Denver group, Silver Cliff. 
13. C. myricoides Lx. Denver group, Golden. 
ORIGINAL DESCRIPTIONS 
SIZE AND ForM 
Occidentalis—shrub or small tree, sometimes 6-7 m. high. 
Chrysocarpa—small tree with narrow crown and ascending branches. 
Colorado—small tree with spreading or ascending branches. 
Erythropoda—small tree. 
Cerronis—tree-like, 2-5 m. high, rather widely branched; trunk short and stout, with 
rough bark. 
Coloradensis—a low well-branched tree, but rather more open than the other sorts, about 
10-12 feet tall, isolated specimens being very well rounded and symmetrical (Andrews). 
Bark of the branches gray, irregularly furrowed and checked, with few rather large 
lenticels. 
Twics 
Occidentalis—(no mention). 
Chrysocarpa—twigs of the season somewhat villous when young, becoming glabrous; 
varnished brown, or reddish the second year. 
Colorado—twigs of the season villous, stout, 3-5 mm. thick, purple-brown. 
Erythropoda—glabrous, bright purple or brown-purple. 
Cerronis—young twigs brown, passing into the gray of the older ones; lenticels small, 
nearly white. 
Coloradensis—stoutish, glossy-brown (some of the young foliar twigs slender and green). 
Mr. Eggleston has examined the type, and reports that the twigs are smooth. 
THORNS 
Occidentalis—slender, about 3 cm. long. 
Chrysocarpa—(no mention). 
Colorado—numerous, stout, dark purple; 5-7 cm. long. 
Erythropoda—twigs sparingly armed with slender purple thorns 2-3 cm. long. 
Cerronis—numerous, short (2-3 cm.), stout and thick for the length, straight, rarely a 
little deflexed, very dark morocco-red, with small light-covered lenticels. 
Coloradensis—rather few, often nearly wanting on some branches, glossy-brown, very 
variable as to length (3-5 cm.), straight or slightly decurved. 
LEAVES (blades) 
Occidentalis—oval or slightly obovate, irregularly serrate and sometimes slightly lobed, 
mostly obtuse at the apex, and narrowed or subcuneate at the base, 4-7 cm. long, 
3 or 4 cm. wide, slender-petioled, pubescent beneath, at least on the veins. 
Chrysocarpa—when mature perfectly glabrous, ovate, deltoid or rhombic in outline, 
obtuse at the apex, obtuse or truncate at the base, very finely and sharply glandular 
serrate, 7-9 lobed, firm in texture, dark green above, much paler beneath. 
