lOOi MONOECIA. TETRANDIA. 



©RDEH, TETBANBIA. 



320. BOEHMERIA. Nutt. Gen. 740. 

 [In honor of George Rudolph Boehmer; a German Botanist.] 



Male. Cal. 4 parted. Cor. 0. Nectary 0. 



Fem. Cal- 0. Cor- 0. Style 1. Seed 1, roundish, compressed, margiaate. 



E. CYLiNDRicA. EIL Sub-dioicous; leaves opposite; male spikes glomerate, interrupted; female cylindric. 

 Synon- Urtica cylindrica. Mr. Fu/g-o— False Nettle. 



■ Fl- Beginning of August. Fr. mat. Latter end of i^eptember. 



Hab Moist, shaded grounds; Brandywine: frequent. About 2 feet high. 



B. LATBRiFLORA? Ell. Leaves alternate, on long petioles; flowers glomerate, lateral. 



Fl. Latter end of July, and after. Fr. mat. Latter end of September. 



Hab. Woodlands, along Brandywine: not common. 1 to 2 feet high. 



321. URTICA. JVutt. Gen. 741. 

 [Lat. ttro, to burn, or sting, and tactus, ihe touch; from the effect of the plant, when touched. D« Theis.'} 



Male, Cal. 4 leaved. Cor. 0. Nectary central, mostly cyathiform. 



Fem. Cal. 2 valved, persistent. Cor. 0. Seed I, ovate, shining. 

 U- PUMiLA. Ell. Triandrous, stem shining, siib-peJIucid; leaves opposite; corymbs short. 

 Fu/g-o— Rich-weed. Smooth Nettle. 



Fl. Latter end of July, and after. Fr. mat. Middle of September. 



Hab. Moist, shaded spots: about houses; rivulets, &;c. common. 9 lo 18 inches high. 



U. cioiCA. Ell- Dioicous.' hispid; leaves opposite, lance-cordate, coarsely serrate: spikes clustered, long. 



Ftt/g-o— Common Stinging Nettle. 



Fl- Middle of June, and after. Fr- mat. August, and after. 



Hab. About houses; roadsides, &c. frequent. U lo 3 feet high. 



Ohs. A naturalized foreigner; well known to all who have ever handled it. It is so abundant about some 

 houses as to be very troublesome. 



U- PROCEEA? Ell. Dioicous; leaves opposite, lance -ovate, serrate; petioles ciliate; spikes subramose. 

 /";. Beginning of August. ' Fr. j?iaf. Latter end of September. 



Hab- Low, moist grounds: Patton's: frequent. 2 to 3 feet high: somewhat glabrous. 



U. DivARicATA. Ell. Leaves alternate, ovatc, sub-glabrous; panicles axillary, divaricately branched. 

 Fl. Latter end of July, and after. Fr. mat. Last of September. 



Hab. Moist, shaded grounds: along rivulets, &c. frequent. 2 to 3 feet high. 



Obs. Nearly allied to the following; but smaller, and not so hispid. 

 U. CANADENSIS. Ell. Hispid; leaves alternate, cordate-ovate; panicles divaricately branched. 

 Fl. Beginning of August, awd after. Fr. mat. Last of September. 



Hab. Miry, shaded grounds: forks of Brandywine, &c. frequent. 3 to 6 feet high. 



Obs. I have not yet made myself sufficiently familiar with this repulsive genus, to he confident that I 

 have enumerated all our species,— or that I have determined them all correctly: but I incline to think the 

 foregoing may be relied upon. 



S22. ALNUS. Nutt. Gen. 737. 

 [Obscure: See Be Tkeis. " Vocatur ab^lmne, quiain fluminealitur." Boerh.'] 



Male, Ament with receptacles cuneiform, truncate, 3 flowered. Cal. a scale. Cor. 4 parted. 

 Fem. -<4ment sub-ovate. Cai. scales 2 flowered. Cor. 0. 5'eed compressed, ovate, naked. 



A. SEKRULATA. Mx. Arb. Leaves obovate, acuminate, doubly serrulate; stipules oval, obtuse.' 

 Siynon. Betuja serrulata. Mx. Fl Am. Fw/g-o— Common Alder. Candle Alder- 



Fl. Latter end of March. Fr. mat. Middle of October. 



Hah. Swamps; and along rivulets: common, 6 to 10 feet high. 



Oba. This is one of our earliest flowering shrubs. The male aments are formed during the preceding au- 

 tnmn, and a few warm days in Marcli are sufficient to develope them. This is sometimes called Black Al- 

 der:, but that name properly belongs to the Prinos verticillatus. 



