DICOTYLEDONOUS PLANTS 179 



XXIV. LAY'IA, Tidy-tips (BLEPHARIPAP'PUS) 



Annual herbs with alternate leaves. Heads many-flowered, 

 with wedge-shaped, 3-toothed rays. Bracts of the involucre 

 in one series, with papery margins and pointed tips, com- 

 pletely enclosing the ray akenes. Receptacle flat, with, a row 

 of chaffy scales between the ray and the disk, or chaffy through- 

 out. Kay akenes linear, often purplish, narrowed to the base, 

 flat on top, without pappus. They bloom in the spring. 



a. L. glandulo'sa Hook. & Am. Loosely branching, about a foot 

 high, hairy, and sprinkled above with stipitate, dark-colored glands. 

 Pappus of disk flowers, of 10-20 stout bristles, that are densely white- 

 woolly below the middle. Heads medium-sized, with 8-13, 3-lobed, 

 conspicuous white or rose-purple rays and yellow disk. Widely 

 distributed. 



b. L. platyglos'sa Gray. TIDY-TIPS. Loosely branching or often 

 simple-stemmed, hairy, and glandular. Lower leaves pinnately 

 lobed, with narrow divisions. Heads with large rays, bright yellow, 

 edged with white. Pappus of 15-25 stout, rough bristles, that are not 

 woolly. Ray akenes smooth, those of the disk silky-hairy. Through- 

 out California. (There are several other species not so easily 

 distinguished.) 



Tribe 6. HELENIOI'DE^:. Similar to Helianthoidece, but 

 without chaffy scales on the receptacle. 



XXV. BAE1UA, Golden Fields (LASTHENIA) 



Low annuals with opposite leaves, entire or irregularly pin- 

 natifid into linear lobes. Heads small, on slender peduncles, 

 terminating the branches or stems. Involucre formed of a 

 single series of flat, oblong scales. Rays entire or 3-toothed, 

 oval or oblong. Receptacle conical, rough, with projecting 

 points that bear the akenes. Akenes angled or nerved. Pap- 

 pus either scales or bristles, or none. These little plants 

 cover the ground for acres, and look like a golden carpet 

 spread over the earth. Some species have a sweet, rather 

 heavy perfume. 



B. gra'cilis Gray. SUNSHINE. This is the most widely spread spe- 

 cies, but it is not easily distinguished from the others. Fragrant. 



