Hosta rectifolia
aka Tachi Gibōshi (Erect, upright, stately hosta)

According to The Genus Hosta by W. George Schmid (1991), as the name implies, it has a very distinct, upright form to the clump. It is related to the species H. sieboldii.

The dark green to blue-green, glaucous leaves of this species have an upright form. It grows into a large size hosta about 24 inch high by 70 inches wide. The leaves have stout petioles and are lanceolate, flat and smooth. This species bears striped, purple leaves with purple anthers from mid-August into September. There are short green bracts on the flowers scapes.

From the Field Guide to Hostas by Mark Zilis (2014), "Many variegated forms of H. rectifolia exist, most found in the wilds of Japan."

The New Encyclopedia of Hostas by Diana Grenfell (2009) states: "A broad-spectrum species with many attractive variegated forms not yet in commerce. The scapes are known to tower over 7 ft. (2.1 m), a characteristic that could more often be exploited in hybridizing programs."

Mark Zilis' Field Guide to Hostas (2014) states that this species was found in Japan in "...swamps; wetlands; woodlands..."

Taxonomists (people who categorize and name living organisms such as plants) can go into dizzying detail in their arguments over what constitutes a species. However, for most of us, a simple definition is that the plant either currently exists in the wild or there is evidence (fossils, herbaria specimens, etc.) that it once did.

In his investigations, Schmid (1991) found such evidence for 43 species of hostas including the following:

Our database has listings of cultivars related to each of these species of hostas.

In nature, variations occur within plant species that are not great enough to warrant naming an entire new species. These identifiable variations on the wild species are called varieties. Yes, this term is commonly also used, although incorrectly, to signify what is really a cultivar i.e. cultivated variety.

In addition to the 43 species listed above, Schmid (1991), also listed the following significant botanical varieties (naturally occurring) and forms of the genus Hosta:

H. clausa normalis

H. kikutii caput-avis

H. kikutii var. kikutii forma leuconata

H. kikutii var. polyneuron

H. longipes var. caduca

H. longipes forma hypoglauca

H. longipes latifolia

H. longipes forma sparsa

 
H. longipes forma viridipes
H. longipes var. vulgata

H. longissima var. longifolia

H. montana forma macrophylia

H. plantaginea var. japonica

H. sieboldii forma angustifolia

H. sieboldii forma okamii

H. sieboldii forma spathulata

 

 
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