OF ARTS AND SCIENCES: MAY 13, 1873. GG1 



able section TucJcermannia, L. maritimia Gray, which is reinforced by 

 a succulent woody-stemmed species of the Californian Islands, L. 

 gigantea Kellogg. This, however, has not yet flowered here in cul- 

 tivation. It may be only an insular variety of the other. 



Although not here in its proper place, I close the present portion of 

 this article with the characters of the following interesting genus : — 



MESONEURIS, Nov. Gen. Senecionidearum. 



Capitulum homogamum, multiflorum, floribus hermaphroditis tubu- 

 losis. Involucrum campanulatum, bracteolis lineari-filiformibus paucis 

 laxis stipatum ; squamis 12-15 biseriatis sequalibus oblongo-lanceo- 

 latis, medio concavis subherbaceis 3-5 nerviis, basiincrassatis(carnosis?) 

 marginibus pi. m. scariosis. ' Receptaculum convexiusculum, epaleatum, 

 fimbrillis subulatis inter flores. Corollae hypocraterimorphae ; limbo 

 usque ad tubum angustum requilongum 5-partitum, lobis linear ibus 

 marginibus aestivatione induplicatis, medio nervo valido percursis, 

 nervis intramarginalibus tenuissimis. Stamina fauci inserta : antherae 

 lineares, basi breviter bidentatae. Styli rami crassiusculi subcomplanati, 

 extus puberi nervo medio valido percursi, apice subtruncato magis hir- 

 telli. Achenia cylindracea, enervia, areola epigyna (modo Seneciomim) 

 annulo magno incrassato circumdata. Pappus e setis rigidulis scabris 

 uniserialibus corolla? tubum baud superantibus. — Herba austro-Mexi- 

 cana, foliis alternis bipinnatifidis. petiolo basi spathaceo-auriculato cau- 

 lem amplectente, capitulis cymosis, floribus albis. 



M. bipinnatifida. — Mexico, in the cold region of the mountains, 

 province of Chiapas, Ghiesbreght, no. 805 of new collection. — 

 somewhat robust perennial, two or three feet high, and probably often 

 taller, with some lax and deciduous pubescence, woolly-tufted at the 

 base of the stem. Lower leaves a foot long, including the petiole ; the 

 foliaceous sheathing auricle an inch or two in length ; uppermost leaves 

 reduced to these spathaceous sheaths. Heads half an inch long. 

 Lobes of the corolla 2 lines long ; the tube 5-nerved below, the nerves 

 as usual running to the sinuses, their continuation within the margin 

 of the lobes very slender : the median nerve of the lobes more promi- 

 nent than in the other and rare cases in which it is manifest at 

 all, but gradually vanishing after reaching the tube. The genus is a 

 remarkable one on several accounts (and doubtless Senecioneous 

 although the corolla recalls Hymenothrix) : in deriving the name 

 from the nervation, I have taken the less-used diminutive vevpls, so as 

 not to come too near Mezoneuron. 



