168 pi:ktandeia. digynia. 



flowered? Petals obl()ng--oval, white, externally cinereous - 

 green, near the points. Lepanthiunn white, -Mtbont tube! 

 perfectly sessile. Poilinium short, lobes even, angularly 

 infracted, styles 2, long. II ab. From Carolina to Florida^ 

 Specimen collected by Ur. Baldwin, from whom 1 receiv- 

 ed it, under the name ot ./?. cinerea. 



f f Leaves scattered, or verticillate. 



18. verticillata. Stem erect, often branching, marked 

 witli pubescent lines, leaves smooth, nan'cnv linear, crowd- 

 ed, mostly verticillate; tube of the lepanthiuni con- 

 spicuous, segments very short, awi.s long and falcate. 

 39. longifoUa. Flowers greenish. — In Cai-olina, Georgia, 

 Illinois, and Lousiana Nearly allied to A. •viridifiora 

 of Prrsh, ifnot the same.-j- i20. *' Uuni^inosn. Plant very 

 low, decumbent, and j^artly Umnginous; leaves ovate, scat- 

 tered, umbell solitary, terminal. Obs. 4t!j 6 inches high; 

 root tuberous, flowers greenish. My specimen was very 

 imperfect. Had. About 30 miles below the confluence 

 of "White river with the .Missouri, on dry and gravelly 

 hills. It is the only species which I met with in the up- 

 per part of Lou'siana. 21. tuherosa. 



The United States alread}' aflbrd about half as many 

 species of this genus as the rest of the world, thus far 

 explored. 'I'he tropical parts of Americ;i, according to 

 Persoon, produce only 5 spec es. At the Cape of Good 

 Hope tliere are 9; 5 in India and Ceylon; 1 in Persia, 

 besides A. sifriaca, 1 in China, 2 in Arabia Felix, 1 in 

 Daiiria, and 1 in Siljcria. The 2 European species ap- 

 pear either referrible to Cormnchi/m or to const tute a dis- 



f This plant, acordingto K. l^rown, is a species of his genus 

 Gomphoiarpns, if the mere al)sence of the coruiculum or arista, 

 usu:dlv arising out of the concave lobes of the lepanthium, can 

 be considered of generic importance; the sin.u:!e denture or 

 "aiiricle" as it was called by Linnaeus in his description oi As- 

 clepias fruticosa {Gomphocnvpns frvticosys, of R. Hrown) termi- 

 nating either side of the lobe, we ha\c already shown to be 

 common to several genuine species of Asclepias, (such as A. 

 stinaca, A .phitohiccoides, &,c. and remarkably in A. civerea.) The 

 armature of the follicle, its being smooth or muricated, is like- 

 wise an unimportant cliaracter, there being indubitable species 

 of Asrkpias, both with one and the other. There are also spe- 

 cies of Goiiohbtis with costate, muricate, and smooth folucles. 



It is nothing less than a duty to the public, which prompts 

 me to tliese observations on the ingenious labours of a man so 

 eminently iiidefatigable, so accurate, and so justly celebrated. 

 it is also highly probable, that this very revision has already 

 been made by Air. I{. Brown himself. 



