118 
means that the information was given either verbally or by cor- 
respondence, as they were co-workers. 
Michaux, in Fl. Bor. Am. 2: 50 (1803), described the genus 
Petalostemum, taking as types P. albidum, pl. 37, f. 1, and P. vio- 
laceum, pl. 37, f. 2. Under it he included Auhnistera Carolinensis 
Lam., calling it P. corymbosum. 
_ Willdenow, in Sp. Pl. 1338 (1803), issued subsequent to Mich- 
aux’s Flora, places the plant under Dalea, and calls it Dalea 
Kuhnistera, taking his characters from Ventenat, the latter clause 
of whose description reads: “ Quodlibet florum, capitulum magno- 
bractearum numero est tectum, quae calycem communem quasi 
repraesentant et totae plantae habitum Eupatorii conciliant.” 
Poiret, in Lam., Encycl. 5: 694 (1804), calls it Psoralea corym- 
éosa. After mentioning the corymbose heads, he adds: “They 
are provided with large oval bracts, scales, almost like an involucre, 
at the base of the flowers.” 
Pursh, in Fl. Am. Sept. 462 (1814), takes up the name Pefalos- 
temon corymbosum, of Michaux, and remarks: “ This singular plant 
appears, at first sight, to belong to the class Syngenesia (Compos- 
itae), and certainly is the connecting link between that class and 
the present.” 
De Candolle, in Prodr. 2: 244 (1825), assigns it to a section 
Kuhnistera, of Petalostemon, and asks: “An genus proprium?” 
Bartling, in Ord. Nat. Pl. 410 (1830), treats Kuhnistera and 
Petalostemon, as separate genera. . 
Don, in Gen. Syst. 2: 222 (1832), follows De Candolle, and 
quotes him throughout. 
Torrey and Gray, in Fl, N. Am. 1: 312 (1838), say, speaking 
of Petalostemon corymbosus : “ This species, on account of its habit, 
its large involucrate bracts, deeply divided and plumose calyx, and 
narrow. petals, has been separated as a distinct genus, but scarcely 
on sufficient grounds, for several other species have a similar 
calyx and very narrow petals and in P. multiflorum the stem is 
somewhat corymbosely branched. There is no other tie ihe how- 
ever, with. similar spikes.” 
_ Endlicher, in Gen, Pl. 1270 (1840), divides Puiu into 
two sections, Eupetalostemon and Kuhnistera. 
- Lindley, in Veg. King. Ed. 3, 554 (1853), considers Kuhnastera 
and Petalostemon as separate genera. 
