370 BOTANICAL GAZETTE [November 



ingly very thin and dry: nutlets 5, nearly smooth, about 5 



mm 



long. 



This species is not so well represented before me as 1 wish it were, but it 

 is so evidently distinct from the known Rocky mountain species that I have 

 no hesitancy in pronouncing it new. Among the western species it is most 

 nearly allied to C rividaris Nutt. The size of the tree or shrub is not 

 known to me, but from the herbarium specimens I suspect that it is quite 



small. 



H. N. Wheeler 



1898. no. 533; co-type, C. S, CrandalVs collection in the Black canon of 

 the Gunnison, Colorado, August 22, i8q6. 



Cartaegus cerronis, n. sp. — Tree-like in form, 2-5"^ high, rather 

 widely branched; trunk short and stout, with rough bark ; young 

 twigs brown, passing into the gray of the older ones ; lenticels 

 small, nearly white: leaves broadly elliptic-ovate, 3-5^™ long, 

 2-3"^"^ broad, coarsely and serrately few-toothed, the teeth with 

 finer gland-tipped acute serrations, acute or acuminate at apex, 

 the abruptly cuneate base entire or remotely serrulate, light 

 green and perfectly glabrous below, sparsely ciliate pubescent 

 above, especially on the veins ; petiole slender, without glands, 

 chaneled above, 5-20'"'^ long: thorns numerous, short (2-3*''' 

 stout and thick for the length, straight, rarely a little deflexed, 

 very dark morocco-red, with small light-covered lenticels: the 

 paniculate corymb 5-10-flowered, congested in blossom but 

 more open in fruit : calyx tube only 2-3"^°^ long, shorter than its 

 lobes; lobes ovate, with a broad gland-margined acum.ination : 

 petals suborbicular, with shallow crenations, noticeably reticulate 

 veined, 6-8^^ broad : stamens few (1-8, mostly 5-8); anthers 

 large, purple: pistils 5: mature fruit not at hand; nutlets 5. 



This excellent species seems to be an inhabitant of Colorado and 

 Wyoming. I take as the type Baker's no. 46, Cerro summit, Colorado (alti- 

 tude about 2500"'), flowers June 7, fruit July X2, 1901 ; excellent flowering 

 specimens, 660 Ra^naiey, near Boulder, Colorado, May 20, igoi. The fol- 

 lowing numbers from Wyoming, by the writer, are probably the same, though 

 only fruiting specimens are at hand: 2491, Pass creek, i8g6; 606, Casper, 

 1894; also 5060, by E. Nelson, Seminole mts., 1898. It has probably at 

 times been distributed as C rividaris Nutt., but it has rather the appearance 

 of C Dotiglasii Lindl. 



Crataegus sheridana, n. sp. — Becoming a small tree 3-5 

 high ; the young twigs gloss-brown or red-brown, becoming 



m 



