208 CISTACE-iE. 



bryo linear, slender, homotropous ; the radicle about the 

 length of the thin farinaceous albumen, superior, excentric ; 

 the linear cotyledons incumbently uncinate-circinate. 



Shrubs dwarf and casspitose, Heath-like, much branched, 

 hoary-tomentose ; the very small leaves closely imbricated 

 on the stems and branches, alternate, subulate or linear- 

 oblong, sessile, appressed or somewhat spreading, persistent. 

 Flowers sessile or peduncled, terminating the crowded short 

 branchlets, expanding in sunshine for a single day only, 

 yellow. 



Etymology. Dedicated to Hudson, the author of the Flora Anglica, an 

 English botanist contemporary with Linnaeus. 



Geographical Distribution, &c. A genus of three Eastern North 

 American species, growing in sandy soil chiefly along the coast ; one of them 

 (H. tomentosa) nearly confined to the sea-shore, and to the shores of the 

 Great Lakes, extending northward to Slave Lake. 



PLATE 90. Hudsonia tomentosa, Nutt. ; — branch in flower, of the 

 natural size, from the coast of Massachusetts. (Ipswich, Oakes.) 



1. A leaf, magnified. 



2. Diagram of the flower and aestivation. (The placenta alternate with 



the sepals; but are wrongly placed opposite them.) 



3. Branchlet and flower, enlarged. 



4. A stamen, magnified. 



5. Same, with the anther transversely divided. 



6. Pistil, with the receptacle, magnified. 



7. Same, with the ovary divided vertically, showing the ovules. 



8. An ovule, more magnified. 



9. Dehiscent capsule and persistent calyx, enlarged. 



10. A seed, more magnified. 



11. Vertical section of the same, showing the embryo in the albumen. 



