Ebook links

1.  Plant Systematics Third Edition An Intergrated Approach- Gurcharan Singh 

archive.org/details/PlantSystematicsThirdEditionAnIntergratedApproach 

2. Practical Plant Identification- James Cullen

www.pdfdrive.com/practical-plant-identification-including-a-key-to-native-and-cultivated-flowering-plants-in-north-temperate-regions-e158778348.html