AND GENERA OF PLANTS. 363 



nearly smooth. Stigma abrupt, pubescent, terminated by a minute cone. 

 Rays about twelve to fourteen, retuse, and almost equally three-toothed. — 

 A nearly smooth, stemless biennial, with opposite, pseudopinnate, almost 

 capillary leaves; scapes or peduncles one-flowered, very long. Ray and disk 

 yellow. 



Leptosijne Californica. 



Hab. Near St. Diego, Upper California. Flowering in the beginning of May. About a foot 

 high; scapes numerous, terete. Outer involucrum eight-leaved, linear, pubescent at base, as long 

 as the inner, of which the divisions are ovate, and likewise eight. Rays about twelve to fourteen, 

 styliferous, shortly three-lobed, the stigmas filiform, smooth ; with an imperfect, flat, and smooth 

 achenium. Receptacle elevated as the fruit becomes mature ; paleae flat, oblong-oval, or ovate, 

 obtuse, membranaceous, deciduous, three-nerved in the centre; the achenium at first rather thin, 

 scabrous, and scattered with short, glandular hairs, at length curved, with a thick, spongy margin, 

 and often a similar, enlarged centre ; the seed itself narrow-oblong. Allied to the section Chryso- 

 melea of Coreopsis; but the peculiar character of the achenium and styliferous rays remove it. 



*TUCKERMANNIA. 



Capitulum many-flowered, heterogamous ; rays feminine, fifteen to twenty, 

 fertile; discal florets hermaphrodite, tubular, five-toothed. Stigmas ex- 

 serted, the summit flat, beneath pubescent and obtuse, terminating in a very 

 short cone. Receptacle paleaceous, flat; the palese oblong, membranaceous 

 and nerveless. Involucrum double, the exterior shorter, leafy, six to eight- 

 parted, the interior eight to ten-parted. Achenia elliptic, alated, flatly com- 

 pressed and naked, smooth, without pappus, and, as well as the wing, dark 

 brown. — A succulent, perennial plant of Upper California. Leaves alter- 

 nate, bipinnatifid, smooth and fleshy; the segments linear and divaricate. 

 Stem one to three-flowered, scapoid, the pedicel very long and naked. 

 Flower large, resembling that of a Silphiutn; disk and ray yellow. Rays 

 three-toothed at the apex, longer than the disk. — (Named in respect to Mr. E. 

 Tuckerman, Jr., w^ho has devoted his attention to the neglected Cryptoga- 

 mous plants of the United States.) 



Tucker mOjunia * maritima. 



Hab. On shelving rocks, near the sea, at St. Diego, in Upper California. A very showy and 

 curious plant. Flowering in May. After the period of flowering it remains for a month or two 



