208. 
1. Receptacle naked. (Also, disc flowers yellow). 
3. Heads in spikes, racemes, or panicles. (Also, 
rays and pappus absent). Expected (Artemisia). 
3. Heads solitary or in corymbs. 
4, Receptacle conical, at leastin fruit. (Also, 
rays and pappus absent). Expected (Matricaria). 
4, Receptacle flattish or low-convex. 
5. Ray flowers present; pappus none; achenes 
5- to 10-nerved. (Also, rays white 
(in species collected) or yellow)............ Chrysanthemum 
5. Ray flowers absent; pappus a low crown; achenes 
3- to 5-angled. Expected (Tanacetum). 
Achillea 
Achillea milleforium L. Common Yarrow 
Java Farm. Infrequent to moderately abundant at main building 
area, in grassy fields south of main buildings (hectares 2499, 3409), 
and in triangular area at entrance gate on old Muddy Creek Road 
(hectare 2463). Associate species: Poa pratensis (turf), 
Erigeron canadensis, Plantago lanceolata, Duchesnea indica, Cyperus 
strigosus. Higman 10, 517. 
Anthemis 
Anthemis arvensis L., var. 
agrestis (Wallr.) DC. 
(variety not in Britton and Brown) Corn-chamomile 
Ivy Neck. One station: beside tractor trail on Scaffold 
Peninsula, between cornfield and grassy abandoned field. Hectare 
4771. Associate species: Hordeum pusillum, Plantago virginica, 
Linaria canadensis, Specularia perfoliata. Higman 694. 
Chrysanthemum 
Chrysanthemum leucanthemum L. Ox-eye Daisy 
Java Farm. Infrequent in old fields. Dominant species: Rhus 
radicans, Rubus spp., Solidago spp., Lonicera japonica. Associate 
species: Oxalis stricta, Rumex acetosella, Lespedeza cuneata, 
Barbarea vulgaris. Higman 652, 758. 
