10 BAILEY, Adventitious Vegetation of St. Anne 's-on-the- Sea. 



recorded its occurrence in Flintshire in the Journal of 

 Botany for this month (vol. 45, p. 144). 



I met with a solitary example of an Ambrosia in open 

 ground much disturbed by lime-pits and building opera- 

 tions, which I thought might be referred to A. psilo- 

 stac/iya, DC ; it had minute spines at the crown of the 

 fruit — a character which it shares with A. artemisifolia. 

 But at Kew it was determined to be artemisifolia. It is 

 the only example which I have met with of that species 

 reaching the fruiting stage, its reproduction at St. Anne's 

 being evidently by the underground stolons. 



Ambrosia trifida, Linn. This is another American 

 species, known under the names of big ragweed, horse- 

 weed, and wild hemp, which is frequently found growing 

 in this country, but always in ground suggesting non- 

 nativity. Mr. Jas. E. McDonald sent it to me from 

 railway sidings at Heaton Mersey last year. It occurred 

 at St. Anne's in great profusion, with fully-matured 

 fruit, last October, on the western side of All Saints' 

 Road — a site now covered by houses. At St. Anne's it 

 reproduces itself from seeds very freely. The neighbour- 

 hood of the docks at Birkenhead thirty or more years ago 

 used to furnish A. elatior, Linn., but this species has not, 

 so far, been detected at St. Anne's. 



Gcertneria {Franseria) acanthicarpa, (Hook.), Britton, 

 = Ambrosia acaniJiicarpa, Hook., also occurred, but only 

 as a solitary example. 



Hemizonia pungens, Torr. and Gray, a Californian 

 plant, and one of the American tarweeds, or spikeweeds, 

 has occurred several times, but in no large numbers. It 

 is a dwarf species belonging to the Composite, with small 

 sessile heads of yellow flowers, and rather rigid subulate 

 undivided stem-leaves. I was unable to identify it, and I 



