160 ROSACEAE 



sepals roiiiul-iiv.ilc, oblusc. scarious-mar^ined; petals (il)ii(|U('ly i-oiiiKJisli, crinkled; 

 stamens about 40 to 50; I'ollieles 3 to 7 (or 9), oblong-cylindrie, G to 10 lines long, 

 20 to 2r)-seeded. 



Islands off the California and Lower California coast: Santa Catalina Island; 

 San Clemente Island; Guadalupe Island. JMay. 



Refs. — Crossosoma cajlifornicum Nutt. Jour. Acad. Phil. scr. 2, 1: 150, t. 22 (1847), type 

 loc. Catalina Isl., Gambcl; Masters, Gard. Chron. scr. 3, 34: 130 (1903) ; Trask, Erythca 7: 139 

 (1899); .Tcpson, Man. 475 (1925). 



2. C. bigelovii Wats. Erect bush 3 to 4 feet hifrh, witli slender branches and 

 short ri<::id branelilets; leaves mostly fascicled, glaucous, the blades ovate-oblong, 

 sometimes obovate, obtusish and apiculate, 4 to 9 lines long, subsessile; peduncles 

 3 lines long; corolla white, aging pink or rose, 3I/2 to 5 or 8 lines wide; petals oval 

 or obovate, with cuneate claw; stamens 15 to 21 "or 30"; follicles 2, rarely 3 or 1, 

 2 to 5-seeded. 3 to 4 lines long. 



Rocky canons in the desert, 100 to 3000 feet : Colorado Desert. East to Arizona, 

 south to Lower California. Apr. 



Locs. — Indian Canon, Collins A^alley, Jepson tf- Button 8855; Santa Rosa Mts. (caiions w. 

 of Coachella), Clary 657; Palm Sprs., Parish 4105; Warrens Well, T. Brandegee. 



R<'fs. — Crossosoala, bigelovii Wats. Proc. Am. Acad. 11: 122 (1876), type loc. near mouth 

 of Bill Williams Eiver, Ariz., Bigdow ; Jepson, Man. 476 (1925). C. californicum Torr. Pac. 

 R. Rep. 4: 63, pi. 1 (1857), excluding plant of Nuttall. 



ROSACEAE. Rose Family 



Herbs, shrubs or trees. Leaves alternate, commonly with stipules. Flowers 

 regular, commonly perfect, solitary or in clusters. Calyx 5 (or 4) -lobed. Petals 5, 

 rarely none. Stamens 10 to numerous, rarely fewer, usually indefinite in number, 

 inserted with the petals on the calyx-tube (or liypanthium-tube) or on the edge 

 of a disk that lines the calyx-tube. Pistils 1 to many, simple, distinct and free from 

 the calyx, or united into a 2 to 5-celled ovarj- which is nearly or completely inferior. 

 Fruit a pod (follicle), an achene, a drupe, a cluster of drupelets (as in a black- 

 berry) or a pome. Seeds with straight embryo; endosperm usually none. — In cer- 

 tain genera the cal3^x appears double by reason of a row of bractlets alternate with 

 the calj-^i-lobes. Coleogj^ne and Lyonothamnus have opposite leaves. — Genera 90 

 and species about 1500, all continents but massed in the north temperate and boreal 

 regions. 



Bibliog. — Lindley, John, Observations on the natural group of plants called Pomaceae (Trans. 

 Linn. Soc. 13:88-106, t. 8-11, — 1822). Don, D., Description of Cowania, a new genus of plants 

 • • * (Trans. Linn. Soc. 14:573-575, t. 22, figs. 1-6,-1825). Roemer, M. J., Rosiflorae (Synopses 

 mongraphicae 3:1-249. — 1847). Baillon, H., Rosaceae in The Natural History of Plants'l:335- 

 471, figs. 373-503, — 1871. Decaisne, M. J., Memoire sur la faniille des Pomac6es (Nouv. Arch. 

 Mus. Hist. Nat. Paris 10:113-192, — 1874). Maximowicz, C. J., Adnotationes de Spiraceis (Acta 

 Horti Petrop. 6:i-xi, 105-261,-1879). Watson, S., On the genus Eriogynia (Bot. Gaz. 15:241- 

 242,-1890). Greene, E. L., The genus Kunzia (Pitt. 2:298-299, — 1892) ; The N. Am. Neilleae 

 (Pitt. 2:25-31,-1889); Sieversia (Pitt. 4:48-50,-1899); An extension of Osmaronia (Pitt. 

 5:309-312,-1905); Segregates from Sieversia (Lflts. 1:174-179,-1906); Certain rosaceous 

 genera (Lflts, 1:123-246,-1906). Bicknell, E. P., The N. Am, species of Agrimonia (Bull, 

 Torr, Club 23:508-523, pis. 282-283, — 1896). Koehne, E., Beitriige zur Kenntnis der Sorbus- 

 Arten (Gartenfl. 50:406-^12). Rydberg, P. A., Rosaceae in N. Am. Fl. 22:230-533,-1908; 

 Notes on Rosaceae: I. Opulaster, Spiraea, Petrophytum, Luetkea, Aruncus (Bull. Torr. Club 

 35:535-542, — 1908) ; II. Schizonotus, Chamaebatiaria, Sericotheca, Horkelia, Horkeliella, Ivesia, 

 Comarclla and Stellariopsis (30:397-407,-1909); IIL Potentilla (37:375-386,-1910); IV. 

 Potentilla, cont. (37:487-502,-1910); V. Potentilla, cont. (38:79-89,-1911); VL Argentina, 

 Comarum, Duchesnea, Fragaria, Sibbaldia, Sibbaldiopsis, Dasiphora, Drymocallis (38:351-367, — 

 1911) ; VII. Alchemilla, Aphanes, Sanguisorba, Poteridium, Poterium, Acaena, Agrimonia, Ade- 

 nostoma, Coleogyne (41:3]9-332, — 1914); VIII. Dryas, Geum, Sieversia, Cowania, Fallugia, 

 Kuntzia vs. Purshia, Chamaebatia, Ccrcocarpus (41:483-503, — 1914) ; IX. Rubacer, Rubus (42: 

 117-160,-1915); X. Rubus hvbrids (42:463-479,-1915); XI. Roses of Cal. and Nev. (44: 

 65-84,-1917). Bitter, G., Die Gatt. Acaena (Biblio. Bot. 17'*: 1-336, tt. 1-37, figs. 1-98,— 



