p 



10 DIAXD1UA DIGYNIA 



Obs. Found In August, 1830, by my friend Pavid Town-send, Esqr. to whose 

 extraordinary seal) and Botanical acumen, I am indebted for the detection atf 



determination of many of our rare and difficult plants. Two or three other spe- 

 cies are enumerated In the United States. I have not h^d an opportunity to exatn. 

 Snathe fructification of our species of L.-nuu ; and have, consequently, t>een 

 Obliged to give that portion of the description upon the authority of others. The 

 figures and description by Prof. Hooxbr, in the Flora tondinmisiSi appear to te 

 complete and ample. 



£j* Sub-Diandrous, Labiate Flowers; with Seeds apparently naked, 



[Lycopus. Cunila. Hedeorna. Monarda. Salvia, and Cullu^onia. Didynamia Gym, 

 nospermia.'] 



rj* Sub-Diandrous, Irregular Flowers; with Capsular Fruit. 

 (.'Gratiola* Lindornia, and Catalpa. Didynamia Angiospermia ] 

 [Lcpidiom virginicum. I'etradynamia Siluulosa 1 



Order Q. Digynia. 



10. PODOSTEMUM. Mr. Kuu. Gen. 729. 



[Greek, Putis, poJos, a foot, and Steman, a Stamen ; the stamens being supported. 



on a common footstalk.] 



SuB-Moxoicors : Flowers in an entire sac, or qpathe. Calyx 0. 

 Corolla 0. Stamens 2 (rarely 3), collateral, supported on a common 

 pedicel, — or, rather, monadelphous below. Ovary oblong-ovoid, bisu!- 

 eate, striate. Stigmas 2, go p pile , recurved. Capsule oblong-oval, 2- 

 <vlled, 2-valvcd, many seeded. Seeds minute. 



Small, submersed, coriaceous aquatirs : attached to rocks or pebbles in shallow, 

 running waters; leaves alternate, inuilifid ; flowers axiil ar y. Kat. Ord. 163. 

 Lin*ll. Podosteme.*. 



I. P. CKRATOPHYLirir, Jfx. Leaves dichotomously many-parted; pe- 

 duncles solitary, axillary. Beck-, Bot. />. 124, Icon. Jl.r. .im. 2. tab. 

 44. 



iloRX-LEATED Po 1)0 STEM t' M . 



Annual) Root none: the plant adhering to pebbles by fl*«?hy processes from 

 t"he stem. Stem creeping, 1 or 2 to 4 inches long, roundish, Smooth, branching ; 

 1 he branches attaching themselves to small pebbles,— -or, in. deep water, often 

 erect. Leaves alternate, somewhat crowded above, dichotomo UB iy dissected ; seg- 

 ments flatted, suUinear. coriaceous; petioles fleshy, with stjpular processes at 

 base which slightly sheath the stem. Pcduwlcs axillary, short and fleshy :Jlotcers 

 enveloped in a coriaceous membrane, or spathe, without seam &r natural opening, 

 which is lacerated irregularly round when the stamens burst forth Stamens 2 

 (occasionally 3) : filaments short, united b« low into one larger fleshy fdament, or 

 pedicel. This pedicel is inserted at one side of the ovary, uni« r its base,— with a 

 little, subulate, flesh-colored filament, about a line in length, on each side of it, 

 A similar, but smaller filamentous process, is f »und in the fork, or axil of each 

 Stamen* Ovary with a grooved suture on each side, and 4 darlt purple stria on 

 each half, or valve. Slig'/ias '2. of a fleshy texture, sessile, ( . L rvcd towards tire 



