238 POMACEAE (apple FAMILY) 



acute or acuminate at apex, glabrous below, sparsely ciliate-pubescent above 

 (especially on the veins); petioles slender, without glands: thorns numerous, 

 stout, 2-3 cm. long, morocco-red, with pale lenticels: corymb 5-10-flowered: 

 calyx-lobes with a broad gland-margined acumination, longer than the calyx- 

 tube: petals 6-8 mm. broad, reticulate- veined: stamens 1-8 (generally 5-8); 

 anthers large, purple: styles 5: fruit black or brown; carpels large and some- 

 what dissimilar, the pulp scanty. (C. erythropoda Ashe and probably C. ckryso- 

 carpa Ashe in part.) — Stream banks, in canons; Colorado and Wyoming. 



5. Crataegus Doddsii Ramaley, Bot. Gaz. 46: 381. 1908. A small tree 

 or shrub near the following: the leaves smaller and pleated along the veins 

 at anthesis, shining, glabrous except on the veins below, -obovate, obscurely 

 lobed and the margin serrate: stamens 10 or fewer; anthers white: fruit hard, 

 dark red: nutlets 2-3. (C. chrysocarpa Ashe in part, probably.) — Colorado. 



6. Crataegus sheridana A. Nsls. Bot. Gaz. 34: 370. 1902. A small tree 

 3-5 m. high, with reddish-brown twigs; lenticels few, large; spines slender, 

 curved and deflexed, 4-5 cm. long: leaves oval to almost orbicular, coarsely 

 and incisely toothed, with rather blimt gland-tipped serratures; pubescence 

 sparse and softly strigose on the lower surface of the leaves (mostly on the 

 veins), minute and appressed on the upper, merely ciliate or wanting in the 

 inflorescence: corymb 5-11-flowered: calyx-lobes ovate-lanceolate, glandular- 

 fimbriate: stamens 8-10: styles 3-4: fruit nearly spherical, 8-9 mm. in diam- 

 eter, scarlet-red; the carpels slightly crested-bisulcate dorsally. — Stream 

 banks; through northern Wyoming and westward to Idaho. 



7. Crataegus coloradensis A. Nels. Proc. Biol. Soc. Wash. 17: 175. 1904. 

 A low well-branched tree, 3-5 m. high: leaves 4-5 cm. long, oval to subor- 

 bicular; the base rounded or somewhat cuneate, either entire or minutely 

 serrate ; the upper half incisely coarsely toothed, with finer serrations on the 

 teeth which are slightly calloused but not glandular, ciliate-pubescent above, 

 nearly glabrous beneath except for the ciliate-hirsuteness on the veins: thorns 

 few, stout, variable, 3-5 cm. long: corymb 10-20-flowered, broad; pedicels 

 lanate-pubescent: calyx-tube short, hirsute or lanate, its lobes cut into long 

 gland-tipped teeth: petals 8 mm. broad: stamens 10: stj^les usually 3 (2-4): 

 fruit 10-13 mm. in diameter, dark scarlet-red; the pulp juicy and weU flavored; 

 carpels mostly 3, large, sUghtly ridged on the back. — Cafions of the front 

 range of the Rocky Mountains in Colorado. 



8. Crataegus occidentaUs Brit. Bull. N. Y. Bot. Gard. 1: 448. 1900. A 

 shrub or small tree, sometimes 6-7 m. high; thorns slender, about 3 cm. 

 long: pedicels and calyx pubescent: leaves oval or slightly obovate, irreg- 

 ularly 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: corymbs several-flowered; 

 flowers about 1.5 cm. wide: fruit oval-globose, about 1 cm. long. (C. Colorado 

 Ashe.) — Nebraska and Colorado; also Montana. 



9. Crataegus coloradoides Ramaley, 1. c. 383. Small tree or shrub, the 

 young branches pubescent: leaves more or less blue-green and glossy above, 

 somewhat glaucous beneath, obovate, serrate and obscurely lobed, pubescent 

 on the nerves below and on the petiole which is often half as long as the blade: 

 pedicels pubescent: stamens 10 or fewer; anthers white: fruit pulpy, sweet, 

 spherical, red, about 9 mm. in diameter: nutlets 2-3. — Colorado. 



3. PERAPHYLLUM Nutt. 



Low shrubs with grayish bark, intricately branched, the branchlets short 

 and rigid. Leaves faiscicled at the ends of the branchlets. Flowers solitary 

 or in sessile 2-3-flowered umbels. Ovary 2-celled, each cell becoming partly 

 divided by a spurious partition. 



1. Peraphyllum ramosissimum Nutt. T. & G. Fl. N. A. 1: 474. 1838. 

 Somewhat silky-pubescent or nearly glabrous, 1-2 m. high: leaves narrowly 

 oblanceolate, attenuate into a very short petiole, serrulate or entire: flowers 



