Palo Alto thistle (Cirsium praeteriens)

Same genus

• Vancouver thistle (Cirsium vancouverense)
• Tall thistle (Cirsium altissimum)
• Rose thistle (Cirsium andersonii)
• Franciscan thistle (Cirsium andrewsii)
• Arizona thistle (Cirsium arizonicum)
• Barneby's thistle (Cirsium barnebyi)
• Palouse thistle (Cirsium brevifolium)
• Clustered thistle (Cirsium brevistylum)

The whole genus Thistle (Cirsium)