•64 CUCURBITACE^. 



Leaves pectinately pinnatifid to sinuate-toothed: petals 1 to 2^ inches long 6> 6 



1. 2fl[. dispersa, Watson. Only upper leaves ovate: seeds J line long. 



2. M. micrantlia, T. & G. Leaves ovate, 1 inch long or less: seeds a line long. 



3. M. congesta, T. & G. Bracts membranous at base: petals 3 to 6 lines long. 



4. M. ^acilenta, T. &. G. Petals obovate to oblanceolate, 4 to 8 lines long. 



5. M. liindleyi, T. & G. Leaves ovate or narrower: petals ovate. Cent CaL 



6. M. l£evicaulis, T. & G. Stout: leaves 2 to 8 inches long: petals 2 to 2i inohesion^ 



CUCURBITACE^. 



Flowers all solitary, large, yellow: seeds flat » «••. 1 



Flowers small, white; the sterile racemose: seeds turgid. 8 



1. CUCURBIT A, Linnaeus. 



1. C. perennis, Gr. Leaves 6-12 in. long: flowers 3 and 4 in. long, fragrant. 



2. C. palmata, Watson. Leaves 2-3 in. long, 5-cleft: calyx-tube an inch long. 



3. 0. Califomica, Torr. Flowers an inch long or more; calyx 4 or 6 lines long. 



2. MEGARRHIZA, Torrey. 



1. M. Califomica, Torr. Fruit globose or ovoid: seeds 4, 8-12 lines long. 



2. M. xnacrocarpa. Fruit ovoid oblong, 14-8eeded. Santa Barbara, south. 



3. M. Marali, Watson. Fruit 4 in. long: seeds suborbicular, flattened- 



4. M. Oregana, Torr. Fruit scarcely or not at all armed with spines. Or.-Wash. 



5. M. mxiricata, Watson. Fruit globose, an inch long, 2-seeded, mostly naked. 



Perhaps this genus should be united with Echinocystis, which has flat eeeds. 



The second species la deseribed by E L. Greene imder the name Echinocystis macrocarpa. 



DATISCACE^. 



1. DATISCA, Linnaeus. 

 t. 2X glomarata, B. & EL Dicecious or perfect flowers in leafy spikes^ greenish. 



CACTACEJE. 



Oval or cylindrical plants, covered with spine-bearing tubercles 1 



Depressed-globose plants with tuberculate ribs and woolly at top: spines stout, ringed 3 



Cylindrical ribbed stems branching, 2 to 4 ft. high: spines numerous 3 



Stems made up of flattened or cylindrical joints: spines barbed 4 



