106 NYCTAGINACEAE 



2. Oxybaphus pumilus Standley. Little Umbrella- wort. Fig. 1578. 



Allionia pumila Standley, Contr. U.S. Nat. Herb. 12: 345. 1909. 

 Allionia Brandegei Standley, Contr. U.S. Nat. Herb. 12: 346. 1909. 

 Allionia pachyphylla Standley, Contr. U.S. Nat. Herb. 12: 346. 1909. 

 Oxybaphus Brandegei Weatherby, Proc. Amer. Acad. 49: 492. 1913. 

 Oxybaphus pumilus Standley, Field Mus. Bot. Ser. 8:11. 1930. 



Plants 1-5 dm. high, procumbent or ascending, short-pilose throughout, rarely glabrate with 

 age. Leaves deltoid to ovate-deltoid, 2-7 cm. long, truncate or slightly decurrent on the petiole ; 

 inflorescence viscid-pilose, axillary or in narrow cymes, conspicuously bracteate; involucres 3-4 

 mm. long in anthesis, 7-8 mm. long in age, densely pilose, the lobes obtuse ; perianth 8-10 mm. 

 long, pilose, pale pink ; stamens long-exserted ; fruit 5 mm. long, short-pilose, rugose. 



Rocky desert slopes, Upper Sonoran Zone; San Bernardino and Providence Mountains, California, east to 

 western New Mexico. Type locality: Kingman, Arizona. June-Aug. 



3. Oxybaphus nyctagineus (Michx.) Sweet. Common Umbrella- wort. 



Fig. 1579. 



Allionia nyctaginea Michx. Fl. Bor. Amer. 1 : 100. 1803. 

 Oxybaphus nyctagineus Sweet, Hort. Brit. ed. 1. 334. 1827. 



Plants 3-6 dm. high, ascending, glabrous or nearly so. Leaves petiolate, ovate-lanceolate, 

 3-10 cm. long ; inflorescence many flowered, cymose ; involucre 5-6 mm. long in anthesis, 10—15 

 mm. in age, the lobes obtuse, short-pilose on the margin, sometimes pilose at base; perianth 

 reddish, 8-10 mm. long; pedicels slender; stamens exserted; fruit 5-6 mm. long, pilose, rugose. 



Adventive in southern California; native, Montana to Wisconsin and south to Mexico. Type locality: banks 

 of the Tennessee River. May-Aug. 



Oxybaphus linearis (Pursh) Robinson, Rhodora 10: 31. 1908. A species characterized by linear leaves 

 and purple flowers has been collected at Riverside, California. 



7. MIRABILIS L. Sp. PI. 177. 1753. 



Perennial herbs or shrubs with dichotomously branching stems and opposite entire 

 leaves. Involucres axillary or clustered at the ends of the branches, 1-10-flowered, 

 somewhat accrescent with age. Perianth surpassing the involucre, in ours, funnelform 

 to campanulate-funnelform with short tube. Stamens 3-5, unequal; filaments capillary. 

 Stigma capitate. Anthocarp ellipsoid to oval, smooth or obscurely angled. [Latin, mean- 

 ing wonderful.] 



A genus of about 20 species, native of western North America, Central and South America. Type species, 

 Mirabilis Jalapa L. 



Involucre 3-10 -flowered; perianth funnelform. 



Perianth 1.5-2.5 cm. long; involucre nearly rotate in fruit. 1. M. MacFarlanei. 



Perianth 3.5-5 cm. long; involucre tubular to narrowly campanulate in fruit. 



Fruit 5-angulate; herbage essentially glabrous. 2. M. Greenei. 



Fruit smooth with 10 vertical lines; herbage usually pubescent. 3. M. Froebelii. 



Involucre 1 -flowered; perianth campanulate. 



Lobes of the involucre lanceolate to narrowly lanceolate, equaling or longer than the tube. 



4. M. tenuiloba. 



Lobes of the involucre triangular or acute, sometimes obtuse, mostly shorter than the tube. 



Stems viscid-villous; leaves thick, viscid-villous; flowers white or pink. 5. M. Bigelovii. 



Stems rough-pubescent, sometimes viscid-pubescent to glabrate; leaves rough-pubescent to glabrate; 

 flowers rose-purple. 6. M. laevis. 



1. Mirabilis MacFarlanei Constance & Rollins. MacFarlane's Four-o'clock 



or Mirabilis. Fig. 1580. 



Mirabilis MacFarlanei Constance & Rollins, Proc. Biol. Soc. Wash. 49: 148. 1936. 



Branched finely puberulent perennials, 6-10 dm. high, forming large clumps, the stems de- 

 cumbent or ascending. Leaves short-petioled, orbicular to ovate-oblong, usually obtuse at the 

 apex, sometimes subcordate at the base, 4.5-7 cm. long, about as broad as long; involucres 4-7- 

 flowered, irregularly and usually deeply lobed, the lobes oval, obtuse or apiculate, 1.5-2.5 cm. 

 high, nearly rotate in fruit; perianths rose-purple, 1.5-2.5 cm. long, broadly funnelform with 

 a broad limb, stamens exceeding the perianth ; anthocarp 6-8 mm. long, brownish gray, rugulose, 

 terete but marked at the constricting base with 10 low ribs. 



Known only from the type locality, Upper Sonoran Zone; Snake River Canyon, Wallowa County, Oregon. 

 Type locality: Lower Cottonwood Landing, Wallowa County, Oregon. May. 



2. Mirabilis Greenei S. Wats. Greene's Four-o'clock or Mirabilis. Fig. 1581. 



Mirabilis Greenei S. Wats. Proc. Amer. Acad. 12: 253. 1876. 

 Quamoclidion Greenei Standley, Contr. U.S. Nat. Herb. 12: 358. 1909. 



Perennials 3-6 dm. high, glabrous or obscurely puberulent around the inflorescence, stems 

 many, stout. Leaves thick, short-petiolate, glaucescent, ovate to ovate-oblong, apiculate to acute 

 at the apex, 4.5-10 cm. long; involucres campanulate, 2.5-4 cm. long, 5-lobed, the lobes one- 

 third to one-half the length of the involucre, 5-8-flowered; perianth rose-purple, 3.5-5 cm. long, 



