432 PHANEROGAMOUS PLANTS. 



2. Mentanthes pumila, Dougl. MSS. 

 Villarsia pumila, Griseb. Gent. p. 388. & in Hook. Fl. Bor.-Am. 2, p. 70, t. 157, B. 



Hab. Upper Columbia and its tributaries, Washington Territory. — 

 Grisebach (1. c.) states that he could not determine the position of 

 the ovules, and there was no fruit in the specimens which he exam- 

 ined, so that he was uncertain whether the plant was really a Villarsia 

 or a species of Menyanthes. Our specimens afford the fruit in perfec- 

 tion, and there can be no doubt that the placentae are in the middle 

 of the valves ; so that the plant cannot be a Villarsia. The valves, too, 

 remain entire when the capsule is quite old, and has discharged its 

 seeds. In the position of the placentae this species resembles Menyan- 

 tlies, but it differs greatly in habit, and in the seeds being reticulate- 

 pitted. In some of our specimens several of the capsules were tri- 

 carpellary. 



[Referred rightly by Porter (Hayden's Rep., 1872) to the genus 

 Hesperochiron, Watson in King's Reports, 5, p, 281. H. Califomicus, 

 Watson, I. c, t. 30, is probably but a form of this.] 



Ord 62. A8CLEPIADACEA 



1. ASCLEPIAS, Linn. 



1. Asclepias speciosa, Torr. 



Asclepias speciosa, Torr. in Ann. Lye. N. York, 2, p. 218. 



A. Douglasii, Hook. Fl. Bor.-Am. 2, p. 53, t. 142 ; Decaisne in DC. Proclr, 8, 

 p. 564. 



Hab. Upper Columbia River and southward to the Valley of the 

 Sacramento. — In the California specimens the leaves are thicker, 



