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10. POTENTILLA L. (CINQUE-FOIL. FIVE-FINGER. ) 
Herbs or rarely shrubs, with compound leaves, solitary or cymose 
flowers, valvate bracteolate calyx, mostly deciduous and commonly 
more or less lateral styles which are not elongated after blooming, and 
numerous stamens and achenes, the latter heaped on a dry receptacle. 
1. P. supina L. Stems decumbent at base or erect, often stout, leafy, subvillous : 
leaves pinnate, with 5 to 11 obovate or oblong incisely-serrate leaflets: cyme loose 
and leafy, with small yellow flowers: stamens 20: style terminal: achenes glabrous, 
strongly gibbous on the ventral side. (P. paradoxa Nutt.)—Along the upper Rio 
Grande above the Pecos. 
11. ROSA Tourn. (ROSE.) 
Usually spiny or prickly shrubs, with odd-pinnate leaves and stipules 
cohering with the petiole, conspicuous obovate or obcordate petals, 
numerous stamens, and many pistils becoming bony achenes and in- 
closed in the globose or urn-shaped fleshy calyx-tube which resembles 
a pome. 
* Sepals connivent and persistent after flowering. 
1. R. Arkansana Porter. Very prickly, but without infrastipular spines: stipules 
narrow ; leaflets 7 to 11, subcuneate at base, simply toothed, not resinous: flowers 
corymbose, the pedicels (as well as receptacles) naked: sepals not hispid, the outer 
lobed: fruit globose.—Common in the mountains west of the Pecos; also in Gillespie 
County and northward. 
2, R. Fendleri Crepin. Infrastipular spines straight or recurved ; often with scat- 
tered prickles: stipules short and narrow; leaflets 5 or 7, cuneate at base, usually 
glaucous, the teeth usually simple: flowers small, often solitary, the short pedicels, 
receptacles, and entire sepals glabrous (or the last subpubescent): fruit globose.— 
West of the Pecos. 
* * Sepals spreading after flowering and deciduous: infrastipular spines present, often 
with scattered prickles. 
3. R. foliclosa Nutt, Stems low, with short straight or curved spines: stipules 
narrow ; leaflets 7 to 11, narrow, glabrous or nearly so, with simple teeth: flowers 
solitary, on very short pedicels which (as well as calyx and receptacle) are hispid: 
outer sepals lobed, the base of the calyx persistent on the globose fruit: styles dis- 
tinct, numerous and persistent.—Throughout eastern and central Texas. 
4, R. setigera Michx. (CLIMBING or PRAIRIE ROSE.) Stems very tall and climb- 
ing, with stout recurved scattered spines and no prickles: stipules very narrow ; 
leaflets 3 or 5, oblong-ovate to lanceolate, coarsely and simply serrate, smooth above 
and usually more or less tomentose beneath: flowers corymbose, the slender pedicels 
and sepals hispid, the latter usually with 1 or 2 lateral lobes and the base of the 
calyx persistent: styles persistent and connate into a smooth slender column: fruit 
oblong to globose.—A common eastern species extending into northern Texas. 
12. PYRUS L. (PEAR. APPLE.) 
Trees or shrubs, with showy flowers in corymbed cymes, free stipules 
and urn-shaped calyx-tube which becomes fleshy and incloses and 
coalesces with the 2 to 5 papery or cartilaginous 2-seeded carpels. 
1. P. coronaria L. (AMERICAN CRAB-APPLE.) A small and somewhat thorny 
tree, with large rose-colored very fragrant blossoms few in a simple umbel-like 
