236 



Descriptive Flora 



with Pinaropappus (white dandelion) but differs in the flower 

 consisting entirely of tubular 5-lobed corollas while Pinaropap- 

 pus consists only of strap-shaped corollas and has milky sap. 

 Marshallia has slender green chaffs that rise way above the 

 numerous corollas when in bud. 



Hymenopappus oarolinensis (Lam.) Hymenopappus. 



Wild Cauliflower. 



Greyish green, leafy, rank-growing weeds, simple below, 

 branched above, and bearing wide topped clusters of rayless 

 heads of white composite flowers. Plants woolly when young. 

 Stem leaves simple, alternate. Blades green above, paler and 

 covered with a thin mat of hairs underneath, cut once or twice 

 into many narrow lobes. Flowers composite, consisting of small, 

 white, tubular, 5-lobed corollas in heads about y% across, these 

 in turn united into a flat topped cluster. Ray flowers none. 

 Bracts of the involucre green with white tips. A common way- 

 side and vacant lot weed. April, May and June. 



Hymenopappus rohustus Greene. 



Plants are similar to Hymenopappus oarolinensis above but 

 are permanently and densely covered with white matted wool. 

 Bracts of involucre conspicuously white as well as the stout 

 stems. In sandy soil to the south and east of San Antonio. April, 

 May and June. 



Polypteris oallosa (Nutt.) A. Gray. 



Stiff, wiry branched plant with rose-pink or rose-purple 

 flowers and sticky secretions on the bracts and flower stalks. 

 Leaves simple, alternate. Blades 1 to 2%'" long, linear to 

 lanceolate, hairy, entire or wavy. Flowers composite, less than 1 

 inch across, solitary on leafless, glandular-hairy peduncles, and 

 consisting entirely of about a dozen deeply 5-lobed corollas. Ray 

 flowers none. Bracts of involucre many, narrow, often purplish 

 tipped due to the many short gland-dotted hairs. Achenes 

 small, black, 4-angled, crowned by 8 to 12 membraneous scales. 

 April. In sandy soil. 



