68 PINK ORDER 



2, Flowers in small axillary clusters 



a. Stems prostrate ; sepals 4-5 A. blitoides 



b. Stems erect ; sepals 3 A. graecizans 



Acnida Linne 1753 Acnida, Water-hemp 



(Gr. a-, without, knide, nettle, from its lack of spines) 



PL 9, fig. 20. 



Sepals 5, in the stamen flowers, green, papery, erect, longer than the 

 bracts, petals none, stamens 5 ; sepals and petals lacking in the pistil flowers, 

 ovary 1 -celled, ovoid, stigmas 2-5, warted or plumy, fruit 1 -seeded, 

 flowers small, 1-3-bracted, in terminal and axillary spikes, or clustered in 

 the axils; leaves alternate, petioled, thin; annual. 

 Stems 1-8 ft. high; leaves lanceolate or lance-ovate A. tamariscina 



Cladothrix Nuttall 1849 



(Gr. klados, branch, thrix, hair, from the star-shaped hairs) 



Sepals 5, united, petals none, stamens 5, ovary 1-celled, globose, style 



short, stigma globose or 2-lobed, fruit 1-celled, 1 -seeded, flowers small, 



solitary or clustered in the axils ; leaves opposite, entire ; annual or perennial. 



Stems prostrate or spreading, 4-12 in. long; leaves 



ovate to round C. lanuginosa 



Froelichia Moench 1794 Froelichia 



(Named for Froelich, a German botanist) 



PI. 9, fig. 19. 



Sepals 5, united, denselv woolly, petals none, stamens 5, united, ovary 

 1-celled. stigma 1, globose oi tufted, fruit enclosed in the winged or crested 

 calyx ; flowers perfect, in dense spikes ; leaves opposite sessile entire or 

 wavy ; woolly annuals. 



1. Stems 1.5-4 ft. high; spikes opposite F.floridana 



2. Stems .5-1.5 ft. high; spikes mostly alternate F. gracilis 



NYCTAGINACEAE FOUR-O'CLOCK FAMILY 



Sepals 4-5, corolla-like, united into a bell-shaped, tubular or salver- 

 form calyx, petals none, stamens 3-5, ovary 1-celled, 1-ovuled, style 1, stig- 

 ma globose, fruit grooved or winged ; flowers in terminal or axillary 

 clusters in an involucre of separate or united bracts ; leaves simple entire. 

 1. Leaves below the flowers, i. e. involucral bracts, 



separate Abronia 



