OF ARTS AND SCIENCES. 49 



of one of the thick cotyledons is most peculiar and remarkable, and is 

 strikingly in contrast with the deeply liippocrepiform cotyledons of T. 

 Nuitallii, surrounding the radicle, as represented in Dr. Torrey's plate. 

 I am disposed to keep up the section Tiquiliopsis for these two species 

 with anomalous embryos and appendaged corolla-tube. 



HELiOTROPiEiE Fresenius. The proper stigma in Heliutrophini and 

 Tournefortia, occupying the margin of an annular or peltate disk, and 

 surmounted by an appendage which has generally been taken for 

 stigma, recalls the similar structure in Apocynacece. 



Heliotropium Tourn.* If three genera are to be admitted in the 



* The North American species as now known are : — 

 § 1. EuPLOCA. Vide supra. 



H. CONVOLVULACEUM Gray, 1. c. 

 § 2. EuHELiOTKOPiUM. Heliotropium & Schleidenia (Endl.) Fresenius. 



* Orthostachys R. Br. (Preslcea Mart.). Schleidenia Endl., Fresenius. ' 



+- Appendix stigmatis elongata, subulata. Folia angusto-linearia. 



H. Greggii Torr. Bot. Mex. Bound, p. 137. Corolla limbo amplo : stylus 

 brevissimus. 



H. ANGtiSTiFOLiUM Tofr. 1. c. Cofolla lobis ovato-lanceolatis : stylus gracilis. 

 H. TENELLUM Torr. 1. c. Calyx inaequalis : stylus perbrevis. 



•*- f- Appendix stigmatis brevis conica. 



H. LiMBATUM Benth., var. confertifolicm Torr. Bot. Mex. Bound. Hart- 

 weg's plant, on which H. limbatnm was founded, has the aspect rather of H. his- 

 pidiim than of Torrey's plant of our Mexican border, collected by Berlandier, 

 Gregg, Wright, &c. But Coulter's no. 1051, and corresponding specimens by 

 Dr. Edwards, &c., are intermediate. This var. conferti folium Torr. is very like 

 H. microphijUum Swartz., as represented by Wright's Cuban no. 3139. This, 

 however, has a much smaller corolla and a shorter style; and H . imhricatum 

 Griseb. would seem to be a form of it. 



H. POLYPHYLLOM Lehm. Asper. & Ic. t. 8. H. glomeratuvi A. DC ? H. bitr- 

 siferum C. Wright in Griseb. Cat. Cab. p. 211. Florida, Buckley, &c. 



Var. Leavenworthii {H. Leavenworthii Torr. herb.) is a strict and slender- 

 leaved form ; but specimens recently collected by Dr. Edward Palmer, in the 

 same part of Florida where Dr. Leavenworth collected it, seem to have golden- 

 yellow flowers ! 



H. PHYLLOSTACHYUM Torr. 1. c. 1859. H. myosotoides Chapra. Fl. p. 330, 1860. 

 Berlandier's numbers 1538, 3038, referred to this species by Dr. Torrey, are 

 more probably depauperate states of 11. hispidum HBK. 



» * Flores ebracteati in spicis scorpioideis saepius conjugatis vel 1-2-furcatis : 

 antherae liberae. 



H. Europium Linn. Stigma appendice tenuiter subulata superatum. Nat- 

 uralized southward. 



VOL. X. (n. s. II.) 4 



