8lO PATAGONIAN EXPEDITIONS I BOTANY. 



BACCHARIS ULICINA HUMILIS. 

 On bare parts of the pampas. 



B. ULICINA MULTIFIDA (Gris.) O. Ktze.; see supra, p. 797, Vittadinia 



multifida Gris. 



30. B. UMBELLIFORMIS DC. 



Glabrous shrub. Leaves obovate, obtuse, cuneate, sessile, plane, 

 toothed, i -nerved, not punctate. Heads pediceled, umbellate at the ends 

 of the branches. Scales of the male, campanulate involucre scarious at the 

 margin, densely ciliate. (Chili) ; N. Patagon., by Lago Nahuel-huapi. 



31. B. URVILLEANA Brongn. 



Shrub, with lanceolate, opposite! leaves. ("Description not yet pub- 

 lished," DC. Prodr., vii, p. 282, 1838; nor yet, 1905. Fig. in t. 61, 

 Brongn. Bot. Voy. Coq. See Plate XXXI at the end of this volume.) 



Magellan. 



22. PLUCHEA Cass. 



Herbs (or sometimes in the tropics shrubs), with alternate, dentate 

 leaves and small heads of tubular flowers in terminal, corymbose cymes. 

 Involucre narrow or broad, its scales appressed, several-seriate, imbricate, 

 green. Receptacle naked. Oiiter-flowers 3-cleft, pistillate ; inner 5-cleft, 

 perfect or sterile. Anthers basisagittate, tailed. Pappus i -seriate, sca- 

 brous-bristly. Achenes angulate. 



(Fig. in Eng. and Prantl, iv, 5, p. 176, C-G.) 



Species 30, widespread in warm and temperate regions. 



P. QUITOC DC. 



Annual. Leaves sessile, very decurrent, oblong or lanceolate, callous- 

 denticulate. Corymb compound, subfastigiate. Invohicral scales lanceo- 

 late, subacute. A sweet, aromatic herb. 



(Central and S. Brazil, in swamps); N. Patagon., by Rio Negro. 



23. TESSARIA Ruiz & Pav. (Pleuropappus Nutt, non Less.) 



Shrubs resembling Pluchea, hoary or silky, but with involucral scales 

 scarious, the inner long and bent outwards. Perfect flowers less numer- 

 ous (i-io). Species 4, California to N. Patagon. 



