2:V2 



ROSACEAE 



Cal., Memies. Heteromeles arbutifolia Roem. Syn. Eosifl. 3:105 (1847) ; Jepson, Fl. W. Mid. 

 Crtl. 2S7 (1901), cd. 2, 212 (1911). P. foUolosa Nutt.; Room. I.e. P. nudiflora Nutt. ; Roem. I.e. 

 P. salicifoUa Prcsl, Epim. Bot. 204 (1849), "California ad Monte-Rcy ct ad portuin San Bias 

 Moxici occidontalis", Hocnlc. nctrromcles salicifoUa Al)ranis, Bull. N. Y. Bot. Gard. 6:.381 

 (1910). 27. fremoniiana Doc. Nov. Ann. Mus. Par. ser. 1, 10:144 (1874), type from Cal., Fre- 

 viont. Var. cekina Jepson, Man. 50S nO'Jf)), type loc. Templeton, San Luis Obispo Co., Pearl 

 C. Jarcd. 



28. PYRUS L. Pear. Apple 



Decicliions trees or shrubs with simple leaves and stipules which disappear 

 early. Flowers in corymbs. Caljrs-tube iirnshaped. Petals white or pink, with 

 claws. Stamens about 20. Ovary inferior, 2 to 5-celled, ovules 2 in each cell, the 

 carpels chartaceons; styles as many as the cells, united at base. Fruit a pome.— 

 Species about 50, North America, Europe and Asia. (Ancient Latin name of the 

 pear.) 



1. P. diversifolia Bong. Oregon Crab Apple. Small tree or many-stemmed 

 shrub 10 to 50 feet high; leaf -blades ovate, pointed, serrate, or some 3-lobed or with 

 a coarse tooth on each side, green above, pale, pubescent and eventually rusty be- 

 neath, 1 to 3'^4 inches long ; corymbs 4 to 10-flowered ; petals white, elliptical, 3 to 5 

 lines long; carpels commonly 3; fruits oblong or oblong-ovoid, 6 to 7 lines long, 

 yellowish (or pinkish on one side), aging purple-black. 



Canons and valley flats, 50 to 1000 feet : Napa and Sonoma Cos. to Del Norte 

 Co. North to Washington. Apr.-May (fl.), Aug.-Sept. (fr.). 



Locs.— Napa Soda Sprs. (Fl. W. Mid. Cal. 287) ; Agua Caliente, Sonoma Co. (M. S. Baker 

 in Jepson Corr. 31:540 ms.) ; Sebastopol, If. S. Baker; Santa Rosa Creek, Sonoma Co. (Pac. R. 

 Rep. 4:85) ; White Thorn Valley, s. Humboldt Co., Tracy 6304; betw. Fortuna and Loleta, Hum- 

 boldt Co., Jepson 1917a; Areata, Chesnut ^- Drew; 

 Orick, Humboldt Co., M. S. Baker 196; Lake Earl, 

 Del Norte Co., Davy. ^\[ 



Refs. — Pyrus diversifolia Bong. Veg. Sitcha 

 133 (1832), type loc. Sitka, Alas., B. E. Mertens. P. 



rivularis Dougl.; Hook. Fl. Bor. Am. 1:203, t. 68 ^WW\^j:^/^y^ ^ 



(1834), type loc. Nootka Sound, J/en0ies; Jepson, Fl. '^ ''' ' 



W. Mid. Cal. ed. 2, 213 (1911), Man. 508 (1925). 

 Malus rivularis Roem. Svn. Rosifl. 3:215 (1847); 

 Jepson, Fl. W. Mid. Cal. 287 (1901). 



29. CRATAEGUS L. Thorn 



Thorn}' shrubs or trees. Leaves simple, 

 toothed or lobed, deciduous. Flowers in ours 

 white, heavy-scented, in short corymbs. Ca- 

 lyx-tube urnshaped. Petals roundish. Sta- 

 mens 10 to 20. Ovary inferior, or its summit 

 free. 2 to 5-eelled, or the 2 to 5 carpels merely 

 contiguous and not united; styles distinct. 

 Fruit more or less drupe-like, red or purple, 

 containing 2 to 5 bony 1-seeded nutlets, these 

 united or separable; calyx-lobes reduced to 

 small teeth, persistent. — Species about 55 

 (although multiplied by some to 1000 or 

 more) , north temperate zone. (Greek kratos, 

 strength, in reference to the wood.) 



1. C. douglasii Lindl. Western Black 

 Haw. (Fig. 171.) ]\Iuch branched shrub 5 



to 9 feet high or sometimes a scraggly tree up to 20 or 30 feet high ; thorns stout, 

 % to 1 inch long; twigs reddish; leaf -blades obovate or ovate, doubly serrate above 



Fig. 171. Crataegus douglasii Lindl. 

 a, fl. branehlet, X V2 ', b, fr. branchlet, 

 X 1/2; c, long. sect, of fl., X 21/2; d, 

 petal, X 3. 



