The genus, Halesia (Silverbell), was named in honor of this eminent English philosopher. He did studies of the physiology of vegetables which were published in 1728.

American physician and plant collector from Bristol, Rhode Island, he was a graduate of the Harvard Medical School. He made a trip to China in 1846 and to Japan in 1855.

He sent the first plants of Japanese Honeysuckle a.k.a. Hall's Honeysuckle (Lonicera japonica) and  Japanese Yew (Taxus cuspidata) to the United States from Japan. The first double flowering crabapple, Malus halliana parkmanii is said to have been introduced by Hall from Japan.

Sir Thomas was a wealthy Quaker and for 20 years a silk merchant in China. In 1867 he bought the Palazzo Orengo on the Italian Riviera around which, with his eminent botanist brother Daniel, he created the celebrated garden of La Mortola. In 1960, the garden was given to the care of the Genoa University.

On the death of E.H. Wilson in 1902, Hanbury bought his Oakwood Experimental Garden at Wisley, England and the following year presented it in trust to the Royal Horticultural Society to be open to the public.

Hartweg worked at the Jardin des Plantes in Paris before heading to North America and South America on several plant collection expeditions. He introduced the species Cupressus macrocarpa.

Plants named for him include Pinus hartwegii, Penstemon hartwegii, Fuchsia hartwegii and Asarum hartwegii.

French city planner in charge of the massive alteration to the layout of the City of Paris instituted by Napoleon III in the mid-1800's. He was responsible for the enhancement of monuments, open spaces and vistas in the City. The Place de l'Opéra, the Étoile, and the Place de la Nation were created under his guidance. The Bois de Boulogne and a number of smaller parks were completed then also.

Owner of Terra Nova Nurseries in Portland, Oregon, Heims is an internationally known plant breeder and collector. His specialties are the genera, Heuchera and Tiarella.

Plants he has introduced include Echinacea purpurea 'Ruby Giant', Heuchera 'Amber Waves', Heuchera 'Amethyst Myst', Heuchera 'Cherries Jubilee', Heuchera 'Key Lime Pie', Heuchera 'Plum Pudding', Hosta 'Jade Cascade', and Hosta 'Pacific Blue Edger'.

Irish doctor who worked for the Chinese Customs Service in the 1880s. As an avid botanist, he sent 15,000 plant specimens to the gardens at the Royal Botanic Gardens at Kew, England. He became acquainted with another great plant collector, E.H. Wilson during that time.

After having studied forestry in France, in collaboration with fellow botanist, Henry John Elwes. Augustine wrote his great book, Trees of Great Britain and Ireland, in 7 volumes. He is associated with A. C. Forbes in developing plantings at Avondale Forest Park, County Wicklow, Ireland.

Many plants bear his name including Acer henryi, Lilium henryi, Lonicera henryi, Parthenocissus henryana, Sinowilsonia henryi, Rubus henryi, Tilia henryana, Emmenopterys henryi and Rhododendron augustinii.

He also introduced Rodgersia aesculifolia and Rodgersia pinnata.

Member of Parliament, poet, classicist, rector of Spofforth and Dean of the Collegiate Church of Manchester, England. William Herbert cultivated and hybridized bulbous plants.

His name is commemorated in the genus, Herbertia, a group of iris shaped bulb plants.

The genus, Heuchera (Coral Bells), is named after this 18th century German botanist.

 

He was superintendent of the Cheyenne Horticultural Field Station in Wyoming during the 1930s and 40s. There, he tested over 20,000 species and cultivars of plants for their cold hardiness and suitability for use in the Great Plains Region of the United States. In 1959, he became the director of the Denver Botanical Garden in Colorado.

British nurseryman, founder of the Hillier Arboretum and originator of dozens of superior ornamental plant cultivars, Hillier was also  author of the well known Hillier's Manual. He is often considered to be one of the 20th centuries leading experts on woody plants.

Plants associated with the Hillier family and nursery include Abutilon x suntense 'Jermyns', Ceanothus 'Blue Mounds', Cotinus 'Grace', Daphne 'Valerie Hillier', Eucryphia x hilleri 'Winton', X Halimiocistus wintonensis, Lonicera x purpusii 'Winter Beauty', Malus x scheideckeri 'Hilleri', Phygelius x rectus 'Winchester Fanfare', Robinia x slavinii 'Hilleri', Thuja plicata 'Hilleri', Tilia 'Harold Hilleri', Ulmus x hollandica 'Jacqueline Hillier' and Viburnum x hilleri 'Winton'.

Founder of Heronswood Nursery (now owned by Burpee Seed Co.) near Seattle, Washington, Hinkley is an internationally known plant breeder and collector. He has travelled extensively around the world in search of new plants to introduce into the plant trade.

Plants named for the nursery include Cercidiphyllum japonicum 'Herronswood Globe' and Tiarella wherryi 'Heronswood Mist'.

Garden writer, lecturer and designer, Penelope Hobhouse is the author of several popular gardening books. She has designed gardens across Europe and in the United States. For a number of years, she was in charge of the National Trust Gardens at Tintinhull House in Somerset, England.

Her books include Colour in Your Garden', Plants in Garden History, Penelope Hobhouse on Gardening, Penelope Hobhouse’s Garden Designs, and Penelope Hobhouse’s Natural Planting.

The plant Oenothera 'Penlope Hobhouse' is named for her.

Son of Sir William Hooker, who he succeeded as Director of the Royal Botanic Gardens at Kew, England. Sir Joseph Hooker was a noted plant explorer credited with introducing the magnificent Sikkim series of rhododendrons from the Himalayas in 1850. He introduced the Himalayan birch (Betula utilis) and reported amongst other trees, the biggest of all magnolias, Magnolia campbellii.

Hooker published part one of his Handbook of the New Zeeland Flora in 1864 and part two in 1868.

One of the worlds great early botanists, he became the first Director of Royal Botanic Gardens at Kew, England.  His son, Sir Joseph Hooker (see above), followed him as Director of Kew.

Dr. Hylander was a Swedish scientist who wrote the book, "The Genus Hosta in Swedish Gardens: With Contributions to the Taxonomy, Nomenclature and Botanical History of the Genus" in 1954. He introduced several cultivars including H. 'Ellerbroek', H. 'Fortunei Aureomarginata' and H. 'Undulata Univitata'.