154 RHAMNACEAE 



Leaf-blades oblong to elliptic or ovate, glandular-serrate to subentire. 



Umbels panicled, mostly terminal; leaves dull beneath, glabrate or villous. 



Leaves thin, glossy above, sparingly hairy when young, glabrate in age; pedun- 

 cles finely viscid-puberulent. 4. C. ovalus. 

 Leaves thick, veiny, dull, as well as the peduncles more or less permanently 

 villous. • 5. C. pubescens. 

 Umbels mostly axillary; leaves silky beneath. 



Leaf-blades distinctly glandular-serrate; plant not spiny. 6. C. supsericeus. 

 Leaf-blades obsoletely denticulate or entire: branches often ending in spines. 



7. C. Fendleri. 

 Leaves opposite, very small and thick, not triple-nerved. 



Leaves entire or nearly so; petals white. 8. C. Grcggii. 



Leaves spinulose-toothed ; petals bluish. 9. C prontratus. 



Family 80. VITACEAE. Grape Family. 



Hypogynous disk present; leaves in our species simple, palmately veined and usually 



lobed. 1. ViTls. 



Hypogynous disk wanting; leaves palmately 5-7-foliolate. 2. Parthenocissus. 



1. VtTIS (Tourn.) L. Grape. 



Twigs and leaves somewhat puberulent when young, glabrate in age, except the veins 



and their axUs beneath ; vine high-climbing. 1. V. vulpina 



Twigs and leaves white-floccose when young; plant scarcely climbing. 2. V. arizonica. 



2. PARTHENOCISSUS Planch. Virginia Creeper, American Ivy, 



Woodbine. 

 Aerial rootlets present; tendiils with disks. 1. P. QuinquefoKa. 



Aerial rootlets lacking; tendrils without disks. 2. P. vitacea. 



Family 81. MALVACEAE. Mallow Family. 



style-branches filiform, stigmatose longitudinally on the exterior side. 

 Stamens simnly monadelphous ; flowers involucelled. 



Petals notched at the apex ; carpels beakless, without internal processes. 



1. Malva. 

 Petals not emarginate at the apex ; carpels beaked, with an internal process above 

 the seed. 2. Callirrhoe. 



Stamens more or less united in falanges in a double series; flowers without Involucels. 



3. SIDALCEA. 

 Style-branches terminated by capitate stigmas. 



LQwer seed at least from an ascending ovule; calyx more or less bracteolate. 



Carpels strongly reticulate on the lower part of the sides facing the adjacent car- 

 pels, this portion enclosing the seeds, the upper part of the carpels smooth 

 and empty. 4. Sphaeralcea. 



Carpels not differentiated in an upper and lower portion. 



Carpels thin-walled, loosely investing the 2 or 3 seeds, hirsute; tall perennials 



with maple-like leaves. 5. Phtmosia. 



Carpels reticulate, the rather thick walls closely surrounding the single seed: 

 annuals with round-lobed leaves. 6. Eremalche. 



Lower seed at least resupinate-pendulous; calyx without involucels or these repre- 

 sented by 1-3 setaceous bractlets. 

 Carpels 1-ovuled, the cell fllled with the seed; bractlets present. 



7. DiSELLA. 

 Carpels 3-9-ovuled, several-seeded, dehiscent apically and dorsally; bractlets ab- 

 sent. 8. Abutilon. 



1. MALVA (Tourn.) L. Mallow, Cheeses (fruit). 



Corolla scarcely exceeding the calyx; carpels rugose-reticulate on the back, and with 

 acute or winged margins. 



Calyx becoming much enlarged, and spreading under the fruit, nervose-teticulate; 

 angles of the carpels margined and denticulate. 1. M. parviflora. 



Calyx not much enlarged in fruit, mostly erect, not reticulate: carpels merely acute 

 on the margins. 2. M. pusilla. 



Corolla about twice as long as the calyx; carpels not rugose on the backs, round-mar- 

 gined. 



Plant decmnbent; leaves scarcely crisp; carpels smooth. 3. M. rotundifolia. 



Plant erect; leaves very crisp; carpels veiny-reticulate. 4. M. crispa. 



2. CALLIRRHOE Nutt. Poppy Mallow. l. c. involucrata. 



3. SIDALCEA A. Gray. Wild Hollyhock, False Mallow, 



Rose Mallow. 

 Corolla yellowish white; plant with a creeping rootstock; leaves glabrous. 



1. S. Candida. 

 Corolla pink, rose-colored, or lilac, rarely white; plants with a woody base; leaves pubes- 

 cent. 



