COMPOSITE. 411 



r Bracts of the involucre ending in a simple point or prickle . . . .34 



33 <{ Bracts of the involucre ending in a fringed or toothed appendage, or in 



L several points or prickles, or in a prickle branched at the base . . 35 

 r Receptacle bearing long chaffy bristles between the florets 24. Thistle. 



34 <j Receptacle honeycombed with jagged edges to the cavities, but not bristly. 



L 25. Onopord. 



pinner bracts of the involucre long, linear, shining and spreading, outer 



J ones very prickly. Achenes silky 26. Carline. 



j Bracts of the involucre toothed or jagged, not prickly . 27. Centattrea. 



L Bracts of the involucre prickly. Achenes glabrous 36 



o fi f Pappus of long simple or feathery hairs 24. Thistle. 



1 Pappus of short simple bristles or none . . . ' . . 27. Centaurea. 



LlGULATES. 



o* f Achenes, bearing a pappus of numerous long hairs 38 



I Achenes, without a pappus, or crowned by a few short scales ... 49 



oo f Pappus with some or most of the hairs feathery 39 



I Pappus with all the hairs simple 43 



r Involucre (very long) with all the bracts of equal length . 28. Salsiey. 



39-={ Involucre with outer bracts much smaller, or different from the inner 



L ones 40 



r External bracts of the involucre 4 or 5, broadly ovate or heart-shaped. 



40 ^ 29. Helminth. 



L External bracts of the involucre small and unequal 41 



("Receptacle bearing some long chaffy scales between the florets. 



41 <j 32. Hypoch,ere. 



iReceptacle naked 42 



r Stem leafy, branched, several-flowered, with clinging, hooked hairs. 

 Achenes without a beak 30. Picris. 



42 <j Stem almost leafless, simple or slightly branched, with one or very few 



flower-heads. Achenes usually tapering into a short beak. 



31. Hawe:bit. 

 f^ Achenes more or less flattened. Leaves glabrous, often bearing prickles 



43 <j on the edges or midrib 44 



L Achenes cylindrical or angular. Leaves glabrous, hairy, or downy . 46 

 r Achenes tapering into a slender beak bearing the pappus 45 



44 <j Pappus sessile or not supported on a distinct, slender beak. 



L 34. Sowtiiistle. 



4- J Peduncles radical, with a single flower-head .... 35. Dandelion. 



I Elowering stems, erect, leafy, bearing several flower-heads 33. Lettuce. 

 4P J Achenes tapering into a slender beak, bearing the pappus .... 47 



I Pappus sessile or not supported on a distinct, slender beak .... 48 

 4 Y f Peduncles radical, simple, with a single flower-head . 35. Dandelion. 



I Flowering stems branched, bearing several heads . . . .36. Crepis. 



