Compositae. 83 



III. —HYPO CH/ERIS. 



HYPOCHiE'RIS RADICA'TA (239). Cat's-ear. 7, Pappus feathery, 

 {877) receptacle with scales, involucre oblong imbricated with acuminate 



scales, achenes of all the florets beaked, stem branched glabrous, leaves 



all radical runcinate obtuse rough. Waysides. 



Vf.—ERIGERON. 



Bracts imbricated many narrow, ray florets very numerous in several rows 

 short, disk florets few. 



ERIG'ERON CANADEN'SIS. 8—9. Leaves linear or lanceolate slightly 

 {732) toothed, ray florets minute reddish filiform scarcely longer than the 

 white pappus, disk florets yellowish white. Waste places. 



ERIG'ERON A'CRIS (65). Flea-bane. 7—8. Leaves linear oblong 

 (733) entire, ray florets pale purple scarcely longer than the reddish pappus, 

 disk florets very few pale yellow. Dry banks. 



V.—LACTUCA. 



LACTU'CA MURA'LIS (67). Ivy-leaved Lettuce. 7. Achenes black 



(886) much compressed with a beak shorter than the achene, pappus pilose, 



involucre cylindrical imbricated, scales membranous at the margin, 



receptacle naked, flowers panicled small yellow with 5 florets, leaves 



lyrate toothed with the terminal lobe angled. Old walls and rocky copses. 



Lactuca saliva is the cultivated Lettuce. 



^\.—SONCHUS. 



Involucre oblong imbricated ovate at the base, receptacle naked, pappus 

 pilose short sessile, achenes much compressed without a beak. 



Flower-heads large, S. arvensis. 



Flower-heads small, S. oleraceus. 



SON'CHUS OLERA'CEUS (109). Sow-thistle. 6—8. Leaves entire 

 (889) or pinnatifid sharply toothed, lower ones petiolate, upper ones lanceo- 

 late amplexicaul, flowers small yellow. Waste places. 



SON'CHUS ARVEN'SIS (107). Com Sow-thistle. 6—9. Lower leaves 

 runcinate, upper ones oblong lanceolate, flowers yellow i — 2 in. in 

 diameter. Cultivated fields. 



Vll.—CREPIS. 



Bracts of the involucre many linear equal, receptacle flat naked pitted, 

 achenes nearly terete striate, beak short or none, pappus white and silky. 



Achenes with a distinct beak, C. foetida. 



Achenes without a beak, 367* 



