Commercially available

• Duchess of Portland
• Duchesse de Portland
• Paestana
• Portland Monthly Crimson Rose
• Portland Rose
• Portlandica
• Portlandica semperflorens
• Portlandica vulgaris
• Rosa damascena portlandica bifera
• Rosa menstrua portlandica
• Rosa 'Paestana'
• Rosa portlandia
• R. portlandica
• Rosa portlandica Roess.
• Rosa sessiliflora
• Rosa X paestana 'Duchesse de Portland'
• Rosier de Portland
• Rosier de Portland commun
• Scarlet Four Seasons' Rose
• The Portland Rose

145 favorite votes.  
Average rating: EXCELLENT-.  

Medium red Portland.
Exhibition name: Duchess of Portland (damask perpetual, before 1775)

Bred by Unknown (before 1775).

Damask Perpetual, Portland.  

Red. [Pink to red.].  Mild to strong, damask fragrance.  10 to 15 petals.  Average diameter 3.25".  Large, semi-double (9-16 petals), borne mostly solitary, cluster-flowered bloom form.  Spring or summer flush with scattered later bloom.  Leafy sepals buds.  

Armed with thorns / prickles.  5 to 7 leaflets.  

Height: 2' to 47" (60 to 120cm).  Width: 2' to 3' (60 to 90cm).

USDA zone 4b through 9b.  

Tetraploid

Mike Lowe says Duchess of Portland is a Damask Perpetual and assigns it a date of 1782...
Parentage uncertain, see References for more information. The speculation that 'Slater's Crimson China' was one of the parents was disproved by DNA Analysis at the Claude Bernard University in Lyon, France.
Sangerhausen describe the color of the bloom of The Portland Rose as light red.