ORDER ANG10SPERMIA. 129 



to the United States, being annuals, of which there are 

 only 2, very nearly allied species. The common T. 

 dichotoma, in flower from about July to September, 

 is frequent on gravelly and sandy hills, being low 

 and much branched, with an aromatic and rather 

 heavy odor. The flowers are of a bright blue, and 

 remarkable for the narrow, falcate or curved appear- 

 ance of the upper lip of the corolla. The calyx is 

 also resupinate, or lying along, as it were, upon its 

 back. The stamina are very long, and incurved. 



THE ORDER ANGIOSPERMIA. 



The plants of this order have very little relation 

 with those of the preceding ; and are easily distin- 

 guished by having a proper capsule. The corolla, in 

 many of the genera, is personate or closed, in others 

 open, and approaching to the regularity of the simple 

 pentandrous class. There are here also 2 sections, 

 characterized by the calyx, which is 4 or 5-cleft. The 

 first we shall notice have the 



* Calyx h-cleft. 



The Vervain [Verbena) appears distinctly related 

 to the preceding order, as it has 2 to 4 seeds, or car- 

 pells, inclosed, at first, in a thin evanescent pericarp, 

 but when mature, they appear naked. The calyx has 

 one of its teeth or dentures truncated ; and the corol- 

 la is funnel-formed, with a flat, slightly unequal 5-cleft 

 border. The stamens 2 to 4. Several of the spe- 

 cies are rather common weeds in moist grounds, 

 and by way-sides, particularly the Nettle-leaved Ver- 

 vain {V. urticifolia), with rough leaves, like Nettles 

 in form, and bearing filiform, or very slender spikes of 

 inconspicuous white flowers. The V. hastata is a tall 



