250 Engelmann and Gray, 
clivity of sandstone hills near Industry. May saa Rays 
yellow, turning white when fading. 
268 & 269. Senecio AMPULLACEUS, (Hooks): annuus vel 
biennis; caule erecto fistuloso striato- superne ramoso ; foliis 
inferioribus - obovato-spathulatis in petiolum decurrentibus, 
superioribus ovato-lanceolatis acutis basi subcordata semiam- 
plexicaulibus, omnibus subintegris vel denticulatis; cyma co- 
rymbosa ; pedicellis apice demum incrassatis ; involucro squa- 
mis setaceis paucis ealyepiató; ; radiis 7-9; acheniis: iugi 
canescentibus. 
Var. « enagERRIMUS (No. 268) : caule foliisque angus 
oribus subintegerrimis glabris. Wet prairies. 
. Var. 8 rnoccosus (No. 269) : - caule folüeqtte junioribus 
latioribus cano-floccosis ; superioribus e basi latiore acumina- 
tis, nunc grosse repando-dentatis. — Sandy prairies in loose, 
dry soil. April. Both forms are certainly annual or biennial. 
270. LvaopEswia aPHYLLA; 9 Texana, Torr. & GT. FL 
Il. p. 485. Prairies. June — July. Roots penetrating deep 
into the soil. Some of the radical leaves are runcinate-pinna- 
tifid, with subulate lobes.  . 
271. PYRRHOPAPPUS GRANDIFLORUS, ., Nutt. Prairies, neat 
San Felipe. April. Perennial; the slender perpendicular 
root enlarging, at the depth of a few inches, into an oblong 
tuber, similar to the root of Cynthia Dandelion. Scapes 
several from one root, with or without a bract in the middle. . 
ROTON AscLEPIAS (Oraria) LINDHEIMERI: (n. sp:): md 
perpendiculari inerassata caulem herbaceum  pubescentem 
singulum erectum (vel plures adscendentes) emittente ; foliis 
oppositis ovatis obtusis (aut rarius. ipii basi nunc st 
cordatis breviter petiolatis. utrinque puberulis pedunculis 
brevissimis lateralibus ; ; pedicellis. gracilibus pubescentibus 
corolle laciniis acutiusculis subduplo longioribus ; cucullis ad 
apicem sensim dilatatis subtrilobatis; processu bifurco, ramo 
altero brevi incluso recto, altero longiore incurvo exserto ; 
folliculis ovato-lanceolatis acuminatis puberulis carina exteriore 
‘setulis mollibus pl. m. conspersis. — Black, ‘daniy soil, ı p 
