SAXIFKAGACEAE (SAXIFRAGE FAMILY) 451 



Calyx-lobes as long as or exceeding the tube. 

 Stamens at length equaling or exceeding ihe calyx-lobes ; berry smooth. 



Calyx 0-12 mm. long S. R. gracile. 



Calyx 5-7 mm. long. 

 Petioles usually bearing only simple elongate glands ; bracts of the 



raceme mostly rounded" at tip ^. R. rotv/ndifolium. 



Petioles bearing mostly compound elongate trichomes ; bracts of 

 the raceme mostly pointed. 

 Principal leaves cuneate to truncate at base. 

 Mature leaves glabrate or slightly pilose beneath . . . 5. R. oxyacanthoiden. 

 Mature leaves densely soft-pubescent . . (5) R. oxyacanthoides, v. calcicohi. 



Principal leaves subcordate at base ... (5) R. oxyacanthoides, v. saxofmm 



Stamens distinctly shorter than the calyx-lobes ; berry hairy or glandular 6. R. Grossularia. 



* * Flowers several in elongate racemes. (Curkants.) 



Calyx campanulate to saucer-shaped. 

 Leaves sprinkled, at least beneath, with resinous atoms ; calyx cam- 

 panulate ; fruit black. 

 Calyx-tube equaling the lobes. 



Bracts shorter than the pedicels S. R. nigrum. 



Bracts longer than the pedicels 7. R.floridum.. 



Cah'x open-campanulate. the lobes much exceeding the short tube . 9. R. hudsonianum. 

 Leaves with no resinous atoms (except occasional glands on the pedi- 

 cels) : calyx dattish. 

 Stems densely covered with jirickles ; fruit black . . , . IQ. R. lacusire. 

 Stems without prickles ; fruit red. 



Ovarj- and berries glandular-bristly 11. R. pro stratum. 



Ovary and berries smooth. 

 Upright shrub ; middle lobe of leaf ovate ; pedicels without capi- 

 tate glands ; calyx yellowish 12. R.vulgare. 



Decumbent shrub ; middle lobe of leaf deltoid ; pedicels with 



capitate glands ; calyx purplish 13. i?. triste. 



Calyx salver-form, with elongate tube 14. -ff. aureum 



1. R. Cyn6sbati L. (Prickly G., Dogberry.) Infra-axillary spnies sZe»(Zf^r. 

 0.5-1 cm. long ; leaves round-ovate, rounded or subcordate at base, soft-piihf^s- 

 cent ; racemes loose, 2.5-6 cm. long ; stamen^ and undivided style not longer than 

 the broadly hell-shaped calyx; berries large, armed with long prickles or rarely 

 smooth. — Rocky woods, w. Me. to the mts. of N. C, w. to Man. and Mo. 

 Var. GLABRATUM Femald. Leaves glabrate or only sparingly pilose on the 

 nerves beneath. — O. to N. C. 



2. R, huronense Rydb. Said to resemble B. Oynosbati, but with shorter 

 rsicemes, calyx-tiibe slender, and styles united only belovj the middle. — L. Huron. 



3. R. gracile Michx. (Missouri G.) Spines often long (7-17 mm.), stout 

 and red ; ppduncles long and slender; flowers white or whitish ; filaments capil- 

 lary, 1-1.5 c??i. long, generally connivent or closely parallel, soon conspicuously 

 longer than the oblong-linear calyx-lobes, (i?. missouriense Nutt. ) — Ct. to S. 

 Dak. and southw. 



4. R. rotundifblium Michx. Spines short (2-5 mm. long); /eaves rather finu, 

 sparingly pilose beneath, mostly rounded at base; p)eduncles short; flowers 

 greenish or the lobes dull purplish ; filaments slender, 4-7 mm. long, more or 

 less exceeding the narrowly oblong-spatulate calyx-lobes. — Rocky banks, w. 

 Mass. and N. Y., s. in the Alieghenies to N. C. 



5. R. oxyacanthoides L. (Smooth G.) Spines 3-8 mm. long; leaves thin 

 but leathery, glabrescent, the petioles often with some naked glands among the 

 compound trichomes; peduncles very short; flowers greenish yellow to dull pui'- 

 l)lish ; stamens iLsually equaling the rather broadly oblong mostly glabrous calyx- 

 lobes. — Nfd. to Pa., w. to N. Dak. and Man. — The common smooth-fruited 

 gooseberry of the North, the whitish prickles and spines often numerous. Var. 

 CALciVoLA Fernald. Leaves densely so ft-puhe scent; calyx pubescent. — Marly 

 swamps and limestone rocks, e. Que. and n. Mich. Var. sax6sum (Hook.) 

 Coville, Calyx and subcordate leaves essentially glabrous. — Nfd., e. Que., Cape 

 Breton I., L. Superior, Rocky Mts. 



0. R GrossiilXria L. (European G.) Spines stout, 1-1.5 cm. long; 

 pechmcles very short. \{rareJ.y 2)-floioered ; calyx hirsute, its lobes oblong. 

 (R. Uva-crispa L. ) — Escaped from cultivation and locally established in Que., 

 N. E., and the Middle States. (Introd. from Eu.) 



7. R. fl6ridum L'llev. (Wild Black C.) Leaves slightly heart-shaped, 



