ROSACEJE. (ROSE FAMILY.) 161 



11. SIBBALDIA, L. 



Calyx flattish, 5-cleft, with 5 bractlets. Petals 5, linear-oblong, minute. Sta- 

 mens 5, inserted alternate with the petals into the margin of the woolly disk 

 which lines the base of the calyx. Achenes 5-10; styles lateral. Low 

 and depressed mountain perennials ; included by some in Potentilla. (Dedi- 

 cated to Dr. Robert Sibbald, professor at Edinburgh at the close of the 17th 

 century.) 



1 . S. procumbens, L. Leaflets 3, wedge-shaped, 3-toothed at the apex ; 

 petals yellow. Alpine summits of the White Mts., and northward. (Eu.) 



12. ALCHEMILLA, Tourn. LADY'S MANTLE. 



Calyx-tube inversely conical, contracted at the throat ; limb 4-parted with as 

 many alternate accessory lobes. Petals none. Stamens 1-4. Pistils 1-4; 

 the slender style arising from near the base ; achenes included in the tube of 

 the persistent calyx. Low herbs, with palmately lobed or compound leaves, 

 and small corymbed greenish flowers. (From Alkemelyeh, the Arabic name, 

 having reference to the silky pubescence of some species.) 



A. ARVENSIS, Scop. (PARSLEY PIERT.) Small annual (3-8' high), leafy ; 

 leaves 3-parted, with the wedge-shaped lobes 2-3-cleft, pubescent; flowers 

 fascicled opposite the axils. Va. and N. C. (Adv. from Eu.) 



13. A GRIM ONI A, Tourn. AGRIMONY. 



Calyx-tube top-shaped, contracted at the throat, beset with hooked bristles 

 above, indurated in fruit and enclosing the 2 achenes ; the limb 5-cleft, closed 

 after flowering. Petals 5. Stamens 5 -15. Styles terminal. Seed suspended 

 Perennial herbs, with interruptedly pinnate leaves, and yellow flowers in 

 slender spiked racemes ; bracts 3-cleft. (Name a corruption of Argemonia, of 

 the same derivation as Argemone, p. 59.) 



1. A. Eupat6ria, L. (COMMON AGRIMONY.) Leaflets 5-7 with minute 

 ones intermixed, oblong -obovate, coarsely toothed ; petals twice the length of the 

 calyx. Borders of woods, common. July - Sept. (Eu.) 



2. A. parviflora, Ait. (SMALL-FLOWERED A.) Leaflets crowded, 11- 

 19, with smaller ones intermixed, lanceolate, acute, deeply and regularly cut- 

 serrate, as well as the stipules ; petals small. Woods and glades, N. Y. and 

 N. J. to Ga., west to Mich., Kan., and La. 



14. POTERIUM, L. BURNET. 



Calyx with a top-shaped tube, constricted at the throat, persistent ; the 4 

 broad petal-like spreading lobes imbricated in the bud, deciduous. Petals none. 

 Stamens 4 - 12 or more, with flaccid filaments and short anthers. Pistils 1 - 3 ; 

 the slender terminal style tipped with a tufted or brush-like stigma. Achcne 

 (commonly solitary) enclosed in the 4-angled dry and thickish closed calyx 

 tube. Seed suspended. Chiefly perennial herbs, with unequally pinnate 

 leaves, stipules coherent with the petiole, and small, often polygamous or di' 

 oscious flowers crowded in a dense head or spike at the summit of a long and 

 naked peduncle, each bracteate and 2-bracteolate. (Name iror-^piov, a drinking- 

 cup, the foliage of Burnet having been used in the preparation of some me- 

 dicinal drink.) 



