HAWTHORNS (CRATAEGUS: ROSACEAE) OF THE CYPRESS HILLS, ALBERTA AND SASKATCHEWAN von Phipps, J.B., O'Kennon, R.J.

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A REVIEW OF CRATAEGUS SERIES ROTUNDIFOLIAE (ROSACEAE) IN WESTERN CANADA von Phipps, J.B., O'Kennon, R.J.

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NEW TAXA OF CRATAEGUS (ROSACEAE) FROM THE NORTHERN OKANAGAN-SOUTHWESTERN SHUSWAP DIVERSITY CENTER von Phipps, J.B., O'Kennon, R.J.

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REVIEW OF CRATAEGUS SERIES PULCHERRIMAE (ROSACEAE) von Phipps, J.B., O'Kennon, R.J., Dvorsky, K.A.

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TWO NEW SPECIES OF LIATRIS SERIES PUNCTATAE (ASTERACEAE: EUPATORIEAE) CENTERED IN NORTH CENTRAL TEXAS von Nesom, G.L., O'Kennon, R.J.

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Paliurus spina-christi (Rhamnaceae) new for North America in Texas von O'Kennon, R.J

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Euphorbia lathyris (Euphorbiaceae) new for Texas von O'Kennon, R.J

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THREE NEW SPECIES OF CRATAEGUS (ROSACEAE) FROM WESTERN NORTH AMERICA: C. OKENNONII, C. OKANAGANENSIS AND C. PHIPPSII von PHIPPS, J.B., O'KENNON, R.J.

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CRATAEGUS NANANIXONII (ROSACEAE, SER. INTRICATAE) A NEW SPECIES OF HAWTHORN FROM EASTERN TEXAS von PHIPPS, J.B., O'KENNON, R.J.

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