Dicotvls or Exogenous Plants. 121 



Sen-e'-ci-o ob-o-va'-tus Miihl. [S. aureus var. obovatus T. & G.) 

 Golden Ragwort: Squaw-Weed. — Differs from the precediug in having^ 

 the root-leaves thicker, round-ovate, with a cuneate or truncate base, 

 or the earliest almost sessile in rosulate tufts. 



Sen-e'-ci-o bal-sam'-i-tae Muhl. [S. aureus var. halsamitcc T. & G.) 

 Golden Ragwort; Squaw-Weed. — Compared with the preceding less glab- 

 rate; root-leaves olilong, spatulate or lanceolate, narrow^ed to the 

 petiole, serrate, the upper lyrate-piunatifid; heads rather small and 

 numerous. 



XC. Order CI-CHO-RI-A -CE /E. CHICORY FAMILY. — Flowers in 



heads surrounded Ijv a scaly involucre ; corolla ligulate in all the 

 flowers; anthers, calyx and ovary as in the preceding Order; herbs 

 with milky juice and alternate leaves. 



Heads small terminating the naked scapes or branches Adol>o;j,iiii. 1 



Head large and solitary, on a hollow scape Taraxaciini. '1 



1. Genus AD-O-PO'-GON. [Krigia). — Heads several-many-flow- 

 ered, corollas all ligulate; involucral scales several, in about 2 rows, 

 thin ; achenes short and truncate ; pappus double, the outer of thin 

 chaffy scales, the inner of delicate bristles. 



Ad-o-po-gon car-o-li-ni-a'-num (Walt.) Britt. [Krigia virgiuiea 

 Willd). Dwarf Dandelion. - Pappus of o-7 short roundish chaff and o-7 

 alternating bristles ; stems becoming branched and leafy ; earlier 

 leaves rounded and entire, the others narrower and often pinnatifid. 



Ad-o-po'-gon vir-gin'-i-cum (L.) Kuntze. [Krigia aiuplexicaulis 

 Nutt.) .Dwarf Dandelion. — Pappus 10-15 small oblong chaff and 10-15 

 bristles; stem leaves 1-3, oval or oblong, clasping, mostly entire ; the 

 radical ones often toothed rarely pinnatifid. 



2. Genus TA-RAX'-A-CUIW. — Head many-flowered, large, solitary,, 

 on a slender, hollow scape ; corollas all ligulate ; involucre double, 

 the outer of short scales ; apex of the achene prolonged into a very 

 slender beak, bearing the copious, soft white bristles. 



Ta-rax'-a-cum ta-rax'-a-cum (L.) Karst. [T. oJficiua/eWeh.) Dande- /^ ./ 



lion. — Leaves radical, pinnatifid or runcinate; flowers yellow. ilj~^ 7 /G 



