[Oxybaphus L'Her.; Willd. Sp. Pl. I: 185. 1797.]

Forking herbs, with opposite equal leaves, and involucres in loose terminal panicles or solitary in the axils of the leaves. Involucre 5-lobed (of 5 partially united bracts), 3-5-flow-ered, becoming enlarged and reticulate-veined after flowering. Perianth campanulate, its tube constricted above the ovary, its limb corolla-like, deciduous. Stamens 3-5, generally 3, unequal, hypogynous. Fruit obovoid or clavate, strongly ribbed, pubescent in most species. [Name in honor of Chas. Allioni, 1725-1804, a botanist of Turin.]

About 40 species, natives of North and South America, one Asiatic. Type species: Allionia ziolacea L.

Fruit pubescent.

Leaves narrowly linear, sessile or very nearly so, 4" wide or less.

1.

A. linearis.

Leaves from linear-lanceolate to ovate-cordate.

Leaves sessile or nearly so, lanceolate to oblong.

Pubescence fine and short, often wanting below the inflorescence.

2.

A. albida.

Pubescence, or some of it, of long hairs, especially below, and at the nodes.

3.

A. hirsuta.

Leaves manifestly petioled, ovate, often cordate.

4.

A. nyctaginea.

Fruit glabrous.

5.

A. Carletoni.

I. Allionia Lineàris Pursh. Narrow-Leaved Umbrella-Wort

Fig. 1726

Allionia linearis Pursh, Fl. Am. Sept. 728. 1814. Calymenia angustifolia Nutt. Fraser's Cat. Name only.

1813. Oxybaphus angustifolius Sweet, Hort. Brit. 429. 1830.

Stem slender, terete or somewhat 4-angled below, glabrous, glaucous, 3'-4 1/4o tall, erect, the branches and peduncles sometimes puberulent. Leaves linear, thick, i-nerved, 1/2'2 1/2' long, 1"-4" wide, obtuse or acute at the apex, sessile or the lower occasionally short-peti-oled; involucre about 3-flowered, green before flowering; perianth purple, longer than the involucre; stamens and style exserted; fruit commonly roughened in the furrows between the 5 prominent ribs, pubescent.

In dry soil, Illinois to Minnesota, Wyoming, south to Texas and Mexico. Adventive in Connecticut. June-Aug.

Allionia Búshii Britton and Allionia Bodini (Holz.) Morong, admitted as species in our first edition, prove to be conditions of this species with the involucres solitary in the axils.

Allionia glàbra (S. Wats.) Kuntze, of the Southwest, differing in being glabrous throughout, has recently been collected in western Kansas.

I Allionia Line Ris Pursh Narrow Leaved Umbrella W 68