480 ROSACEAE (ROSE FAMILY) 



of the pedicels appressed ; receptacle broadly ovoid-conic or subglobose. 

 Dooryards, old fields, dry open woods, etc.; chiefly from N. E. to Pa., often ap- 

 pearing as if introduced, but apparently passing without sharp limit into the 

 following clearly indigenous var. americana. (Introd. from Eurasia ?) Var. 

 ALBA (Ehrh.) Rydb. Receptacle white. N. E., N. Y., and Pa. 



Var. americana Porter. Slender, thin-leaved ; pubescence of the scapes as 

 well as of the pedicels and sometimes also of the petioles more or less closely 

 appressed, often sparse ; receptacle more narrowly conical or subcylindric-ovoid. 

 (F. americana Britton.) Common, chiefly in open rocky woods. 



11. DUCHESNEA Sm. INDIAN STRAWBERRY 



Calyx 5-parted, the lobes alternating with much larger foliaceous spreading 

 3-toothed appendages. Petals 5, yellow. Receptacle in fruit spongy but not 

 juicy. Flowers otherwise as in Fragaria. Perennial herb with leafy runners 

 and 3-foliolate leaves similar to those of the true strawberries. (Dedicated to 

 Antoine Nicolas Ditchesne, an early monographer of Fragaria.) 



1. D. INDICA (Andr.) Focke. Fruit red, insipid. (Fragaria Andr. ) Waste 

 ground, grassy places, etc., s. N. Y. and e. Pa. to Fla., Ark., and Mo. (Introd. 

 from Eurasia.) 



12. SIBBALDIA L. 



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

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

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

 depressed perennials. (Dedicated to Dr. Eobert Sibbald, professor at Edin- 

 burgh at the close of the 17th century.) 



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

 yellow. Arctic Am., s. to mts. of e. Que., White Mts., N. H. ; and in the 

 Rocky Mts. to Utah. (Eurasia.) 



13. CHAMAERHODOS Bunge. 



Calyx top-shaped, 5-cleft, without bractlets. Petals 5, obovate, white or 

 purplish, about as long as the calyx-lobes. Stamens o, opposite the petals. 

 Carpels 6-20 ; styles decidedly lateral or basilar, articulated near the base. 

 Ovule solitary, ascending. Erect pubescent essentially herbaceous plants with 

 3-foliolate leaves ; the leaflets cleft into linear segments. (Name from \a.na.l, on 

 the ground, low, dwarf, and p6Sov, a rose.) 



1. C. erScta (L.) Bunge. Glandular-pubescent; root woody; stem erect, 

 1-3 dm. high, often with ascending branches, leafy ; flowers small, crowded in 

 small rounded cymes. Sandy soil, arid prairies, etc., n. w. Minn, to Col., 

 Mont., and Assina. (Siber.) 



14. WALDSTEiNIA Willd. 



Calyx-tube inversely conical ; the limb 6-cleft, with 5 often minute and de- 

 ciduous bractlets. Petals 5. Stamens many, inserted, into the throat of the 

 calyx. Achenes 2-6, minutely hairy ; the terminal slender styles deciduous 

 from the base by a joint. Seed erect ; radicle inferior. Low perennial herbs, 

 with chiefly radical 3-6-lobed or divided leaves, and small yellow flowers on 

 bracted scapes. (Named in honor of Francis Adam, Count of FPa&bfefo-Warteto- 

 burg, a German botanist.) 



1. W. fragarioides (Michx.) Trattinick. (BARREN STRAWBERRY.) Low; 

 leaflets 3, broadly wedge-form, cut>-toothed ; scapes several-flowered ; petals 

 mostly longer than the calyx-lobes. Wooded hillsides, Carlton Co., N. H. 

 (Hay) ; w'. N. E. to Ga., Ind., and Minn. A form with narrow petals about 

 equaling the calyx-lobes has been distinguished as W. parviflora Small 



