ROSE FAMILY 



413 



1. Luetkea pectinata (Pursh) Kuntze. Luetkea. Fig. 2372. 



Saxifraga pectinata Pursh, Fl. Amer. Sept. 312. 1814. 



Luetkea sibbaldioides Bong. Mem. Acad. St. Petersb. VI. 2: 130. 1832. 



Eriogynia pectinata Hook. Fl. Bor. Amer. 1: 255. 1832. 



Spiraea pectinata Torr. & Gray, Fl. N. Amer. 1 : 417. 1840. 



Saxifraga caespitosa A. Gray, Proc. Amer. Acad. 8: 383. 1870. 



Luetkea pectinata Kuntze, Rev. Gen. PI. 217. 1891. 



Flowering shoots 5-15 cm. high, leafy, glabrous or sparsely pilose. Leaves dissected into 

 linear acute divisions, grooved above, 1-1.5 cm. long, glabrate; raceme narrow, 1-5 cm. long; 

 bracts ternate or the upper entire; sepals ovate, acute, 2 mm. long; petals white, round- 

 obovate, 3-3 . 5 mm. long ; stamens and styles included ; follicles about 4 mm. long. 



On moist rocky or sandy slopes, often forming mats, Canadian and Hudsonian Zones; Bering Straits south 

 to Mount Shasta, California, and east to the Canadian Rockies. Type locality: "on the northwest coast," 

 Menzies. July-Sept. 



6. ARUNCUS (L.) Adans. Fam. PI. 2: 295. 1763. 



Tall perennial herbs with thick rootstocks, 2-3-pinnate leaves without stipules. Flow- 

 ers dioecious, in large open panicles composed of many slender spike-like branches. 

 Sepals and petals 5, the pistillate much smaller than the staminate. Stamens 15-30, long- 

 exserted. Pistils 3-5, distinct; styles short; ovules several, pendulous. Follicles reflexed 

 in fruit, dehiscent along the ventral suture and dorsally at the apex; endosperm present. 

 [Greek, meaning goat's beard.] 



Two species, the typical species widely spread in the north temperate zone (sometimes separated into two 

 or three species), the second, in Japan. Type species, Spiraea Aruncus L. 



1. Aruncus vulgaris Raf. Goat's-beard. Fig. 2373. 



Spiraea Aruncus L. Sp. PI. 490. 1753. 

 Aruncus vulgaris Raf. Sylva Tell. 152. 1838. 

 Aruncus Sylvester Kostel. Ind. Hort. Prag. 15. 1844. 

 Aruncus acuminatus Rydb. N. Amer. Fl. 22: 255. 1908. 



Stems erect, 1-2 m. high, glabrous. Leaflets ovate-lanceolate, acuminate, sharply and 

 doubly serrate, 3-12 cm. long, more or less hairy on both surfaces; panicles terminal and 

 axillary, 1(M0 cm. long, the spike-like branches 3-15 cm. long; petals about 1 mm. long; 

 follicles 3 mm. long. 



Moist woods, Humid Transition and Canadian Zones; widely spread over Europe, Asia, and North America. 

 Several forms have been considered as species. The one in western North America has been named A. acumv- 

 natus (Dougl.) Rydb. (N. Amer. Fl. 22: 255. 1908.) It ranges from Alaska to Mendocino County, Cali- 

 fornia. May-July. 



7. CHAMAEBATIARIA (Porter) Maxim. Act. Hort. Petrop. 6:225. 1879. 



Low resinous-glandular aromatic shrubs with bipinnate leaves, paniculate flowers. 

 Hypanthium turbinate. Sepals 5. Petals 5. Stamens about 60. Pistils 5, more or less united 

 below ; ovules about 8, pendulous. Follicles coriaceous, dehiscent at apex and down ven- 

 tral suture. Seeds terete ; endosperm present. [Greek, meaning resembling Chamaebatia.~] 



A monotypic genus of western United States. 



2372 

 2372. Luetkea pectinata 



2373 

 2373. Aruncus vulgaris 



2374 



2374. Chamaebatiaria millefolium 



