64 CUCURBITACEJE. 



Leaves pectinately pinnatifid to sinuate-toothed: petals 1 to 2J inches long 6 f 6 



1. M. dispersa, Watson. Only upper leaves ovate: seeds line long. 



2. M. micrantha, 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. gracilenta, T. & G. Petals obovate to oblanceolate, 4 to 8 lines long. 

 6. HI. Itindleyi, T. & G. Leaves ovate or narrower: petals ovate. Cent Cal. 



6. M. laevicaulis, T. & G. Stout: leaves 2 to 8 inches long: petals 2 to 2 inchealong. 



CUCURBITACE^E. 



Flowers all solitary, large, yellow: seeds flat ..,.. 1 



Flowers small, white; the sterile racemose: seeds turgid. , 3 



1. CTJCUBBITA, Linnams. 



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



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



3. C. Californica, Torr. Flowers an inch long or more; calyx 4 or 5 lines long. 



2. MEGABBHIZA, Torrey. 



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



2. M. macrocarpa. Fruit ovoid oblong, 14-seeded. Santa Barbara, south. 



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



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

 6. M. muricata, Watson. Fruit globose, an inch long, 2-seeded, mostly naked. 



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



The second species la described by E L. Greene under the name Echin&cy&tis macrocarptk 



DATISCACE.E. 



X. DATISCA, Linnaus. 

 1. IX glomerate, B. & IL Dioecious or perfect flowers in leafy spikes, greenish. 



CACTACEJE. 



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



Depressed-globose plants with tuberculate ribs and woolly at top: spines stout, ringed 9 



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



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



