FOUR-O'CLOCK FAMILY 107 



tube abruptly expanding into a broad 5-lobed limb ; stamens as long as the perianth ; anthocarp 



elliptic-oblong, obscurely 5-angled, rugulose, dark brown. 



Hills and stream beds, Arid Transition Zone; Oregon border south in the Inner Coast Ranges to Colusa 

 County, California. Type locality: Yreka, California. May-June. 



3. Mirabilis Froebelii (Behr) Greene. Froebel's Four-o'clock or Mirabilis. 



Fig. 1582. 



Oxybaphus Froebelii Behr, Proc. Calif. Acad. 1 : 69. 1855. 

 Mirabilis multiflora var. pubescens S. Wats. Bot. Calif. 2: 2. 1880. 

 Mirabilis Froebelii Greene, Bull. Calif. Acad. III. 1: 124. 1885. 

 Quamoclidion Froebelii Standley, Contr. U.S. Nat. Herb. 12: 359. 1909. 

 Quamoclidion multiftorum subsp. obtusum Standley, Contr. U.S. Nat. Herb. loc. cit. 



Much-branched perennials 3-8 dm. high, forming large clumps, densely viscid-pubescent 

 throughout. Leaves thick, 6-11 cm. long with stout petioles, broadly ovate, sometimes orbicular, 

 mucronate or acute at the apex ; involucres 5-9-flowered, somewhat accrescent with age, 2-3 cm. 

 long, the lobes about one-third the length of the involucre; perianth rose-purple, 3.5^.5 cm. 

 long, expanded into a shallowly 5-lobed limb, usually viscid-pubescent without; anthocarp 8 

 mm. long, slightly constricted at both ends, brown with darker spots and marked with 10 pale or 

 dark vertical lines. 



Dry sandy soil, Upper Sonoran Zone; southern Nevada and Arizona to Kern County, California, and south 

 to Lower California, Mexico. Type locality: Warner's Ranch, San Diego County, California. April-Aug. 



Mirabilis Froebelii var. glabrata (Standley) Jepson, Fl. Calif. 458. 1914. Differs from the species in 

 being nearly glabrous and except for the vertical markings on the fruits strongly suggests Mirabilis multiflora 

 Torr. With the species in its southern and eastern distribution. 



4. Mirabilis tenuiloba S. Wats. Long-lobed Four-o'clock. Fig. 1583. 



Mirabilis tenuiloba S. Wats. Proc. Amer. Acad. 17: 375. 1882. 

 Hesperonia tenuiloba Standley, Contr. U.S. Nat. Herb. 12: 363. 1909. 



Erect perennial, suffrutescent at the base, 4-6 dm. high with rather stout white branches 

 and swollen nodes. Leaves deltoid to ovate-deltoid, acute at the apex, short-petioled, 2-3.5 cm. 

 long, glandular-pubescent; flowers many, clustered on the ends of the leafy branches, the in- 

 florescence densely glandular-pubescent, sometimes villous; involucre 1-flowered, 9-15 mm. 

 long, the lanceolate lobes equaling or longer than the tube, somewhat accrescent with age; 

 perianth 10-15 mm. long, white ; fruit oval, smooth, brown. 



Sandy desert, Lower Sonoran Zone; San Bernardino County, California, south to Lower California, Mexico. 

 Type locality: near Palm Springs, Riverside County, California. April-June. 



5. Mirabilis Bigelovii A. Gray. Desert Four-o'clock or Wishbone Bush. 



Fig. 1584. 



Mirabilis Bigelovii A. Gray, Proc. Amer. Acad. 21: 413. 1886. 



Hesperonia Bigelovii Standley, N. Amer. Fl. 21: 235. 1918. 



Hesperonia glutinosa subsp. gracilis Standley, U.S. Nat. Herb. 12: 365. 1909. 



Dichotomously much branched, suffrutescent, erect or spreading perennial, stems many, typi- 

 cally stout, glandular-villous even in age. Leaves 1.5-3 cm. long, suborbicular to deltoid-ovate, 

 subcordate to rounded at the base, densely viscid-villous ; flowers in clusters at the ends of 

 the branches ; involucre 5-6 mm. long, densely viscid-villous, lobes shorter than the tube, acute 

 or rounded; perianth 7-11 mm. long, white or pink; fruit dark, ovoid, often mottled and some- 

 times microscopically rugulose. 



Desert canyons, Lower Sonoran Zone; southwestern Nevada and adjacent California south through eastern 

 Mojave and Colorado Deserts to Arizona and Sonora. Type locality: near Peach Springs, Arizona. April-June. 



Mirabilis Bigelovii var. Sspera (Greene) Munz, Man. S. Calif. 151. 1935. Characterized by both scab- 

 rous and glandular-villous pubescence on the stems and usually rose-purple flowers. Western Mojave and Colo- 

 rado Deserts, California. 



Mirabilis Bigelovii var. retrorsa (Heller) Munz, Man. S. Calif. 151. 1935. With scabrous and retrorse- 

 scabrous or glabrous stems and with white or pink flowers. Western Nevada and Mono County to the Colorado 

 Desert, California. 



6. Mirabilis laevis (Benth.) Curran. Coastal Four-o'clock. Fig. 1585. 



Oxybaphus laevis Benth. Bot. Sulph. 44. 1844. 



Mirabilis californi'ca A. Gray in Torr. Bot. Mex. Bound. 173. 1859. 



Mirabilis laevis Curran, Proc. Calif. Acad. II. 1 : 235. 1888. 



Hesperonia calif ornica subsp. microphylla Standley, Contr. U.S. Nat. Herb. 12: 365. 1909. 



Hesperonia cedrosensis Standley, Contr. U.S. Nat. Herb. 12: 262. 1909. 



Dichotomously much-branched perennial, decumbent, woody at the base, the stems many, 

 typically slender, glabrous or scabrous. Leaves ovate to ovate-deltoid, cordate or subcordate, 

 1-4 cm. long, basal leaves often long, petioled, upper short-petioled or subsessile, sparsely 

 glandular-pubescent with coarse or scabrous hairs to glabrate; flowers in clusters at ends of 

 the branches, inflorescence glandular, more or less densely pubescent, involucres campanulate, 

 lobes acute, shorter than the tube, short viscid-villous, sometimes tinged with purple, 5-8 mm. 

 long, scarcely accrescent with age ; perianth funnelf orm-campanulate, rose-purple, surpassing 

 the involucre ; fruit oval to elliptic-oval, dark, sometimes mottled, sometimes marked with 

 paler vertical lines. 



Dry hillsides, Upper Sonoran Zone; in the Coast Ranges and adjacent islands, Santa Lucia Mountains, Mon- 

 terey County, California, south to Lower California. Type locality: Magdalena Bay, Lower California, Mexico. 

 Jan.-Dec. A variable species as to pubescence and habit. 



