FOUR-O'CLOCK FAMILY 259 



1. H. limosa (A. Nels.) Standl. A perennial with a woody base; stems 

 ascending 3-6 dm. high, nearly glabrous; leaf-blades thick, rounded-ovate to 

 cordate, 1-3 cm. long; involucres 4-6 mm. long; calyx rose-colored or purple 

 campanulate, about 1 cm. high; fruit ovate, smooth, 3 mm. long. Mirabilis 

 glutinosa and M. limosa A. Nels. Dry hillsides: Utah Ariz. Calif Nev 

 Son. F-Je. 



7. ALLIONIELLA Rydb. 



Branched perennial herbs, with opposite petioled leaves. Bracts five, united 

 into a gamophyllous viscid rotate involucre, which enlarges somewhat in fruit, 

 but does not become membranous. Flowers in each involucre 3. Perianth 

 open, short funnelform, 5-lobed. Stamens 3, distinct. Fruit ellipsoid, neither 

 angled nor ribbed, very indistinctly tubercled, glabrous. 



1. A. oxybaphoides (A. Gray) Rydb. Perennial; stems diffusely branched, 

 procumbent; leaf-blades cordate, often somewhat acuminate, 2-5 cm. long, more 

 or less puberulent; involucre deeply 5-cleft, glandular-viscid, 6 mm. long; peri- 

 anth campanulate, 7-8 mm. long. Ravines and valleys: Tex. Colo. Utah- 

 Ariz. Son. Submont. Je-S. 



8. ALLIONIA Loefl. UMBRELLA-WORT. 



Perennial herbs, with rather fleshy, entire, opposite leaves. Flowers perfect, 

 1-5 in each involucre, in ours rose-colored or white. Involucre gamophyllous, 

 5-lobed, in fruit enlarging and membranous. Perianth campanulate or funnel- 

 form, often oblique. Stamens 2-5, unequal; filaments very slender and united 

 at the base. Fruit club-shaped, 5-angled or 5-ribbed, usually pubescent and 

 minutely tuberculate. Pericarp adhering to the seed. Endosperm mealy. 

 [Oxybaphus L'Her.] 



Leaves cordate to broadly ovate-lanceolate , all distinctly petioled. 



Leaf-blades cordate or deltoid. 1. A. nyctaginea. 



Leaf -blades ovate, rounded or cuneate at the base. 



Stem glabrous; leaves thin and soft; inflorescence not bracteate. 2. A. floribunde. 

 Stem hirsute; leaves thick and fleshy; inflorescence bracteate. 3. A. polyatricha. 

 Leaves ovate-lanceolate, oblong, or linear, sessile, or only the lower short-petioled. 

 Stem more or less hirsute as well as viscid. 

 Fruit pubescent. 



Leaves ovate or broadly oblong, as well as the stem conspicuously hirsute. 



4. A. hirsuta. 

 Leaves linear-lanceolate, almost glabrous ; stem sparingly hirsute, or glabrous 



except under the nodes. 5. A. pilosa. 



Fruit glabrous. 6. A. Carletoni. 



Stem glabrous below, not hirsute, viscid-puberulent above. 



Flowers solitary in the involucre, on short slender pedicels ; fruit nearly glabrous. 



7. A. glabra. 

 Flowers 2-3 in the involucres, subsessile; fruit decidedly pubescent. 



Lower leaves ovate, rounded at the base. 8. A. sessilifolia. 



Lower leaves lanceolate to linear, tapering at the base. 



Leaves of the cymes much reduced and bract-like; upper portion of the 



stem densely and finely puberulent. 9. A. bracteata. 



Leaves of the cymes neither much reduced nor bract-like. 



Leaves erect or ascending; lobes of the involucre rounded or broadly 



triangular-ovate. 



Plant prostrate or diffuse; involucres and branches of the inflor- 

 escence densely viscid-hairy. 10. A. diffusa. 

 Plants more simple, erect or ascending ; branches of the inflorescence 



usually merely viscid-puberulent. 

 Leaves from ovate- or obovate- to linear-lanceolate, usually 



over 5 mm. wide. 11. A. decumbens. 



Leaves narrowly linear, less than 5 mm. wide. 12. A. linear is. 

 Leaves divergent, distinctly petioled; lobes of the involucre elliptic or 

 oval. 13. A. divaricata. 



1. A. nyctaginea Michx. Stems 3-10 dm. tall, stout, dichotomously 

 branched; leaf -blades 2-10 cm. long; inflorescence paniculate; involucres in fruit 

 about 1.5 cm. broad, pubescent; lobes ovate or triangular; perianth red^ hairy 

 without. Oxybaphus nyctagineus Sweet. Rich soil: Sask. 111. La. N.M. 

 Wyo. Plain. My-Au. 



2. A. floribunda (Choisy) Kuntze. Stems 3-9 dm. high, stoutish, swollen 

 at the nodes; leaf-blades ovate to lanceolate, 2-5 cm. long; inflorescence panicu- 



