NYCTAGINACEAE (FOUR-O'CLOCK FAMILY) 173 



1. Mirabilis multiflora (Torr.) Gray, Bot. Mex. Bound. 173. 1859. Some- 

 what pubescent but not glandular, widely branched, 3-6 dm. high: leaves 

 broadly ovate or deltoid, 3-7 cm. long, mostly rounded at base, on petioles 

 much shorter than the blades: involucres usually 6-flowered: perianth tubular- 

 funnelform, 3-5 cm. long, pale rose to purple, the ovate lobes shorter than the 

 somewhat greenish tube: fruit 6-8 mm. long, obtuse, slightly ribbed below. 

 Quamoclidion multiflorum Torr. Colorado to Texas and California. 



2. Mirabilis oxybaphoides Gray, 1. c. -Stems procumbent, diffuse, slender: 

 leaves all deeply cordate, on rather long petioles, lowest reniform, upper ones 

 acuminate, often subangled: involucre 3-flowered, deeply 5-cleft, very viscid- 

 glandular as is also the peduncles in the loose panicle; lobes ovate, rather 

 acute, a little shorter than the campanulate perianth: stamens 3: fruit sub- 

 globose-obovoid, glabrous, destitute of ribs or angles, blackish. (Allioniella 

 oxybaphoides Rydb.) Colorado to Texas and California. 



2. ALLIONIA Loefl. 



Herbs, simple-stemmed or dichotomously branched, with opposite leaves 

 and flowers in terminal panicles. Involucres mostly 5-lobed, 3-5-flowered, 

 becoming enlarged and reticulate- veined in fruit. Perianth campanulate. 

 Stamens usually 3, sometimes 5. Fruit obovoid or clavate, strongly ribbed, 

 pubescent in our species. Oxybaphus in part. 



Stems more or less hirsute from base to summit. 



Leaves also hirsute . . . . . . . . . 1 . A. hirsuta. 



Leaves glabrous or nearly so . . . 2. A. pilosa. 



Stems glabrous below, more or less viscid-puberulent upward. 



Leaves ovate or cordate 3. A. nyctaginea. 



Leaves lanceolate to linear. 



Perianth-lobes 4, deeply bifid . . . . . . . 4. A. glandulifera. 



Perianth-lobes 4-5, entire (?). 



Branched from the base; the stems diffuse . . . . 5. A. diffusa. 



Mostly simple and erect. 



All the leaves linear 6. A. linearis. 



Some of the leaves broadly lanceolate . . . . 7. A. lanceolata. 



1. Allionia hirsuta Pursh, Fl. Am. Sept. 2: 728. 1814. Rather roughly 

 hirsute or pilose throughout, with jointed hairs, 2-5 dm. high: leaves from 

 broadly to narrowly lanceolate or oblong, sessile or the lowest short-petioled : 

 inflorescence rather short: involucre pubescent: stamens 3 or 5: fruit narrowly 

 ovoid, with obtuse ribs, pubescent. Oxybaphus hirsutus. Minnesota, west- 

 ward and southward to Colorado. 



la. Allionia hirsuta aggregata (Ortega) A. Nels. A reduced form with the 

 involucres solitary in the axils of the upper leaves. See the analogous forms 

 2a and 6a below. (Calyxhymenia aggregata Ortega, Nov. or Rar. PI. 8: pi. 11. 

 1798.) Wyoming to the Dakotas. 



2. Allionia pilosa (Nutt.) Rydb. Bull. Torr. Bot. Club 29: 690. 1902. 

 Resembling the preceding, but the stem less hirsute, often glabrate except 

 below the nodes: leaves glabrate or finely hirsute, lanceolate or narrower, 

 narrowed but blunt at apex, sessile or nearly so : involucral lobes acute : calyx 

 white, 1 cm. broad : fruit obovoid, 5-ribbed and transversely rugose. Same 

 range as the preceding and farther south. 



2a. Allionia pilosa decumbens (Nutt.) A. Nels. Stems low, with decum- 

 bent base: leaves narrower and glabrate: the inflorescence reduced to invo- 

 lucres solitary in uppermost axils. Calymenia decumbens Nutt. Gen. 1: 26. 

 1818. The upper Missouri region and said to extend to Mexico. 



3. Allionia nyctaginea Michx. Fl. Bor. Am. 1: 100. 1803. Stems somewhat 

 4-angled, nearly glabrous, 4-8 dm. high: leaves broadly ovate, acute with cor- 

 date or rounded base, 4-8 cm. long, petioled, glabrous or glabrate: inflores- 

 cence more or less pubescent: perianth red: stamens and style exserted: fruit 

 oblong, pubescent. Oxybaphus nyctaginea. [Allionia floribunda (Choisy) 

 Kuntze, Rev. Gen. 553. 1891.] New Mexico to Wyoming and far to the 

 eastward. 



