Dendrobium-rutriferum-2021-01-13

Dendrobium-rutriferum-2021-01-13***Confirmed as Dendrobium rutriferum (Jan 2021); this plant matches the description on the Orchids of New Guinea website, as well as that in Baker & Baker, with the lip base becoming calceolate due to inrolling of the lip lobes; the subcapitate inflorescences also fit the description, as does the inflorescence length and the longitudinally grooved stems; the finely denticulate lip margin also matches the description and the photos match the images in IOSPE and the OW.***









































Judging Center: St Paul Minnesota

Award Number: 20202562

Award Date: January 25, 2020

Awarded As: Dendrobium rutriferum

Purchased from Andy's orchids, labeled as Dendrobium erosum, I grew it for several years before entering it into a show and at that point decided to cross reference the identification to ensure it was correct since it is a relatively obscure dendro. I noticed that the descriptions I could find for D. erosum did not match my plant. The flower descriptions are quite similar but the plant shapes are very different. I discovered a website, orchidsnewguinea.com, a database of orchid descriptions from over 142 genre native to Papua New Guinea, and I found the photo, description, and for the first time the name Dendrobium rutriferum. I believe the description is a reprint from Lindenia which also has an illustration of the plant. Dendrobium erosum is described as a slender plant with thin bamboo like leaves and sheaths that cover the stems unlike rutriferum, which has fusiform shaped bulbs, broadly lanceolate leaves, and sheaths that do not fully cover the stem. I believe these are the major distinctions between the 2 plants.

Thanks

Plant > Overall length of growth/cane: at least 30 cm and up to 90 cm

Plant Leaf > number of leaves per growth or cane: carrying up to 35 leaves per growth

Plant > Leaf Length: 11.25

Plant > Leaf Width: 3.75

Plant > Leaf Margin: smooth overall, dark green

Plant > Leaf Shape: broadly lanceolate, goes deciduous from the base up over the course of 2 to 3 growing seasons

Plant > Leaf petiole length (apex of pseudobulb or stem to leaf base proper): very short and almost disappears as the leaf widens immediately

Plant > Pseudobulb/Growth/Ramicaul Length: 90 cm

Plant > Pseudobulb/Growth/Ramicaul Width: 1.25

Plant > Pseudobulb/Growth/Ramicaul Margin: elongated, fusiform, grooved longitudinally, purple marked with sheaths that do not fully cover the cane

Plant > Pseudobulb/Growth/Ramicaul distance between growths along rhizome:: closely spaced, 1.25 cm

Plant >Pseudobulb/Growth/Ramicaul Root Tip Color: green

Inflorescence > Overall Length: 2.5-3.75 cm overall

Inflorescence > Arrangement: 3 to 5 short, racemose, many flowered to 50 per inflorescence per growth

Inflorescence > Distance from base of inflorescence to first bud or branch: .25 cm they start almost immediately and cover the whole inflorescence

Inflorescence > distance between flowers along inflorescence: very close like 1 mm, very densely packed

Inflorescence > distance from inflorescence to base of sepals: 1.25 cm

Inflorescence > distance from inflorescence to base of sepals: 1.25 cm

Inflorescence > Floral Bracts Length: triangular to 2 cm

Inflorescence > Floral Bracts Width: .5 cm

Inflorescence > Ovary Length: .625 cm

Inflorescence > Ovary Width: 1-2 mm

Inflorescence > Ovary Shape: slightly larger than the stem

Inflorescence > Ovary Color: pink, darker than the flower

Inflorescence > Ovary Texture: smooth with small grooves

Flower Natural Spread Length: 1.0 cm

Flower Natural Spread Width: 1.1 cm

Flower > Dorsal Sepal Length: .8 cm

Flower > Dorsal Sepal Width: .6 cm

Flower > Lateral sepals or synsepal Length: .7 cm

Flower > Lateral sepals or synsepal Width: .45 cm

Flower > Petals Length: 1.6 cm

Flower > Petals Width: .7 cm

Flower > Lip or Pouch Length: 1.2 cm

Flower > Lip or Pouch Width: .4 cm

Flower > Lip or Pouch> characters of lip (calli, spurs, keels, etc.): lingulate and pandurate, callus above the base, apex is calceolate with a finely denticulate margin. Flowers are bright pink sepals and petals are white tipped and the texture is crystalline

Flower > Column Length: .2 cm

Flower > Column Width: .2 cm

Flower > Column Color: white

Flower > Anther Cap Color: off white

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