38o FLORA. 



i. Acnida cannabina L. Salt-marsh Water-hemp. (I. F. f. 1409.) Succu- 

 lent, stein usually much branched, 0.3-3 m - &IL Leaves lanceolate, acuminate but 

 generally blunt-pointed and apiculate, 5 -15 cm. long, narrowed at the base, entire or 

 slightly undulate ; staminate spikes 2-13 cm. long, usually dense; sepals oblong- 

 lanceolate or ovate-oblong, cuspidate or mucronate ; stigmas slender, papillose- 

 hispid, I mm. long ; utricle 3-5 -angled, 2-4 mm. long when mature, becoming 

 black, much longer than the bracts. In salt and brackish marshes, and up the 

 rivers to fresh water, Mass. to Fla. July- Aug. 



Acnida Flondana S. Wats., a more slender plant, of the southern Atlantic coast, with 

 narrower slender-petioled leaves, the flowers in elongated interrupted spikes, and a smaller 

 utricle, may occur in southern Va. 



2. Acnida tamariscina (Nutt.) Wood. Western Water-hemp. (I. F. f. 

 1410.) Similar to the preceding, the branches usually slender. Leaves lanceolate 

 or ovate-lanceolate, mostly long -acuminate, but sometimes obtuse, narrowed at the 

 base ; spikes mostly loose or interrupted ; sepals lanceolate, subulate-acuminate ; 

 stigmas plumose, rather short ; utricle not angled, 1-2 mm. long, circumscissile; 

 bractlets lanceolate, cuspidate. In swamps, 111. to S. Dak., La. and N. Mex. 

 July-Sept. 



Acnida tamariscina tuberculata (Moq.) Uline & Bray. Tall, erect, sometimes 3 m. 

 high, with flexuous branches; inflorescence spicate ; utricle ovoid, tubercled, indehiscent. 

 Vt. to Manitoba, Tenn. and Neb. This and the following varieties perhaps constitute a 

 distinct species. 



Acnida tamariscina concatenata (Moq.) Uline and Bray. Stems of ten pecumbent ; 

 flowers larger, in separate glomerules. Range of preceding variety. 



Acnida tamariscina prostrita Uline & Bray. Stems diffuse and prostrate or some- 

 times ascending; leaves rarely over 2.5 cm. long, spatulate ; flowers in axillary clusters 

 or in separated glomerules. Mich, to S. Dak. and Mo. 



3. CLADOTHRIX Nutt. 



Diffusely branched stellate-pubescent herbs, with opposite entire or slightly un- 

 dulate petioled leaves, and very small perfect 3-bracted flowers in the axils. Calyx 

 of 5 equal pilose erect dry oblong i-nerved sepals. Stamens 5,. hypogynous, 

 their filaments united at the base, their anthers I -celled. Ovary subglobose; style 

 short; stigma capitate or 2-lobed. Utricle globose, indehiscent. [Greek, branch- 

 hair, from the stellate pubescence.] About 4 species, natives of southwestern N. 

 Am. and Mex. 



1. Cladothrix lanuginosa Nutt. (I. F. f. 141 1.) Perennial, somewhat 

 woody at the base, or sometimes annual; stem much branched, the branches 1-3 

 dm. long. Leaves orbicular, broadly ovate or rhombic-ovate, usually narrowed at 

 the base, entire, inconspicuously veined, 4-25 mm. wide; flowers I mm. broad or 

 less, mostly clustered in the axils of small upper leaves. In dry soil, Kans. to 

 Tex., Ariz, and Mex. June-Sept. 



4. FROELI'CHIA Moench. 



Annual erect woolly or silky herbs, with opposite sessile entire or slightly 

 undulate narrow leaves, or the lower and basal ones contracted into petioles. 

 Flowers perfect, 3-bracted, often bracteolate, in panicled dense spikes. Calyx 

 tubular, nearly terete, 5 -cleft or 5 -toothed, very woolly, its tube longitudinally 

 crested and sometimes tubercled in fruit. Stamens 5. their filaments united into a 

 tube, which is 5 -cleft at the summit and bears the 1 -celled anthers between its lobes. 

 Ovary ovoid; stigma capitate or penicillate. Utricle indehiscent, enclosed by the 

 tube of united filaments. [Name in honor of J. A. Froelich, a German botanist.] 

 About 12 species, all American. Besides the following, 2 others occur in the 

 Southwestern States. 



Stout, 6-12 dm. tall ; crests of fruiting calyx continuous, dentate. 1. F. campestris. 



Slender, 2-5 dm. tall ; crests of fruiting calyx interrupted. 2. F. gracilis. 



I. Froelichia campestris Small. Prairie FROELICHIA. (I. F. f. 

 1412.) Stem stout, the branches leafless above. Upper leaves linear or linear- 

 oblong, acute or acuminate at both ends, 2 S cm. long, the lower spatulate or 

 oblanceolate, 8-15 cm. long, narrowed into margined petioles; spikes mostly 



