Plants Collected in Paraguay. 131 



Borreria tenera, D.C., Prod., iv, 543. 



Asuncion (61) ; between Trinidad and Lympio (t2*7). Novem- 

 ber-May. 



Stems nearly terete below, tetragonous above, 15-25 cm. high, 

 much branched from the base, often ascending, with long tough 

 roots. Leaves sub-setaceous, 1-nerved, often fascicled, sharply 

 callous-tipped. Flowers white or often pale purple, in axillary or 

 terminal verticils, the corolla about 5 mm. long. Stipular setse 3-7, 

 much longer than the sheath. Leaves about the length of the inter- 

 nodes. This rough-looking little plant is found growing along road- 

 sides or on grassy knolls, in hard, dry or clayey soil, and its numer- 

 ous verticils of flowers have a burr-like aspect. 



Borreria verticillata^ Meyer, Prim. Fl. Esseq., 83. 



Asuncion (66 and 106). November. 



A very variable species. Forms growing in dry soil or among 

 grass, with a ligneous root and very thick, hard, knot-like, numer- 

 ous stems, spreading on the ground or ascending 10-15 cm., with 

 crowded leaves. Others are erect, 40-50 cm. high, with nodes 3-6 

 cm. long. Leaves verticillate, linear or linear-lanceolate, 1-3 cm. 

 long, 2-5 mm. broad, revolute and retrorsely scabrous on the mar- 

 gins, acute at both ends ; petiole scarcely any. Stems more or less 

 pilose or scabrous on the angles. Flowers small, white, in dense, 

 globular verticils, which are terminal or axillary and 5-10 mm. in 

 diameter. Stipular setae 4-7 as long as or longer than the sheaths. 

 The prostrate forms of this species might be mistaken for no. 727, 

 but the plant is much coarser, with larger leaves, thicker stems and 

 larger flower verticils. 



Richardia Brasiliensis^ Gomez, Mem. Ipecac, 31, t. 2. 



Asuncion (55). November, 



A rough, prostrate plant, spreading 15 or 20 cm. on the ground, 

 dichotomously much branched. Stems tetragonous, hispid or vill- 

 ous. Leaves obovate or sometimes oblong-lanceolate, 1-3 cm. long, 

 5-10 mm. broad, glabrous or scabrous above, ciliate, acute, attenu- 

 ated into a short petiole. Stipular setae 3-5, hispid, usually shorter 

 than the sheath. Diff'ers principally from Borriera in having ter- 

 minal verticils of flowers seated upon large involucral bracts. In 

 this case the bracts are 2, sessile, oblong, rounded at the apex, 2 cm. 

 long, 1 cm. broad. Flowers minute, white. Calyx 6-lobed, the 



