trtaosPERMtM CoiiVOtVULACJEjEl 49^ 



anthers oblong, sessile : style 2-lobed at the apex : nutlets white, smooth 

 and polished, the inner face rather conspicuously carinate. On dry rocky 

 hillsides, southwestern Oregon to California, 



L. pilosnm Nutt. Journ. Phil. Acad, vii, 43. Soft-hirsute and pu- 

 bescent, pale or canescent stems numerous from the crown of a thick per- 

 ennial root, 6-18 inches high, mostly simple, very leafy : leaves linear to 

 linear-lanceolate, 2-4 inches long, mostly tapering from near the base to 

 apex, often small and bract-like below : flowers densely crowded in a leafy 

 thyrsus : sepals linear 3-4 lines long, hispid : corolla campanulate-f unnel- 

 form, about twice the length of the calyx, silky outside, dull greenish-yellqw, 

 the lobes equalling the throat, nearly naked at the throat but obscurely 

 puberulent and thickened under each lobe : style slender : nutlets broadly 

 ovate, acute, smooth and polished, 2-3 lines long white and bony. Common 

 on dry hillsides and plains, Brit. Columbia to California, and Nebraska. 



Ordee LXVI CONVOLVULACE^ Vent. Tabl. ii, 394. 



Herbs, or some tropical species shrubs or trees, with generally 

 twining or trailing stems, usually milky juice, alternate leaves 

 without stipules, or leafless, truly axillary regular 5-merous, or 

 rarely^4:-merous flowers, except as to the pistil which is almost 

 always 2-carpellary. Calyx mostly of distinct and imbricated 

 sepals , persistent. Corolla either plicate and the pleats convolute 

 or induplicate-valvate or sometimes imbricate in the bud, the 

 limb either lobed or entire. Stamens as many as lobes of the 

 corolla and alternate with them, usually inserted low down on 

 the tube of the corolla; hypogynous disk usually annular and 

 manifest. Ovary 2-celled or rarely 3-celled, with a pair of 

 anatropous ovules in each cell, or spuriously 4- or 6-celled, 

 each cell being more or Jess divided into a pair of 1-ovuled 

 half -cells by a false partition, or rarely 2- or 4-parted from above 

 around the style, Style single or once or twice divided : stigma 

 terminal or introrse. Fruit capsular or sometimes fleshy. 

 Seeds comparatively large, filled, by a crumplted or pleated em- 

 bryo involving or partly surrounding a little mucilaginous or 

 fleshy albumen, its cotyledons ample and foliaceous, or in Cus- 

 cuta a spiral embryo without cotyledons. 



Tkibe 1 Plants with ordinary foliage, not parasitic. Ovary 

 entire. 



1 CouTOlrnlns Corolla plicate at the sinuses pleats twisted in the bud : 

 style undivided or cleft only at the apex. 



Tribe ii Leafless parasitic twining herbs without green color. 



Tribe 1 Oonvolvuleae Choisy in DO. Prddr. ix, 335 Plants with 

 mostly twining or trailing stems, mostly milky juice and ordinary 

 foliage, not parasitic. Ovary entire. 



2 Cnscnta Corolla with mostly spreading lobes, between convolute and 



imbricate in the bud. 



1 CONVOLVDLUS L. Gen. u. 215. 

 Herbs with trailing twining or erect stems, broad leaves and 



