DICOTYLEDONOUS PLANTS 179 



XXIV. LAY^A, Tidy-tips (BLEPHARIPAPTUS) 



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. & Arn. Loosely branching, about a foot 

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

 Pappus of disk floivers, of 10-20 stout bristles, that are densely lohite- 

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

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

 distributed. 



h. 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 yelloiv, 

 edged with ivhite. Pappus of 15-25 stout, rough brittles, 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'deje. Similar to Helianthoidem, but 

 without chaffy scales on the receptacle. 



XXV. BAE'RIA, 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, ivith 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. 



