Question: Which plant has more species, Dracocephalum or Rhynchostylis?

Context paragraphs:
Dracocephalum moldavica: Dracocephalum moldavica (Moldavian dragonhead) is an annual herbaceous plant.  The first formal botanical description of "D. moldavica" was by Linnaeus in "Species Plantarum" 2:595.  1753.

Dracocephalum: Dracocephalum is a genus of about 60 to 70 species of flowering plants in the family Lamiaceae, native to temperate regions of the Northern Hemisphere.  These flowers, collectively called dragonhead, are annual or perennial herbaceous plants or subshrubs, growing to 15 to 90 centimeters tall.

Galeopsis bifida: Galeopsis bifida is an annual plant native to Europe and Asia but now found in Canada and the northeastern, midwestern parts of the United States.  It has many common names such as bifid hemp-nettle, split-lip hemp-nettle, common hemp-nettle, and large-flowered hemp-nettle.  The genus name means weasel-like, referring to the corolla of the flower.  It is often confused with other species of Lamiaceae such as "Mentha arvensis", "Dracocephalum parviflorum" and "Stachys pilosa".

Dracocephalum rupestre: Dracocephalum rupestre is a plant species in the genus "Dracocephalum", endemic to China.  The specific epithet, ""rupestre"", is derived from Latin, and pertains to the plant growing among rocks.

Rhynchostylis: Rhynchostylis (abbreviated Rhy in the horticultural trade) is a genus in the orchid family (Orchidaceae), closely allied to the genus "Vanda" (from which it differs in the one-lobed lip of the flower) and comprising four currently accepted species native to the Indian Subcontinent, China, Indochina, Malaysia, Indonesia and the Philippines.  The name consists of a compound of two Greek elements : "rhynchos" 'beak' and "stylis" 'column' - in reference to the very boad, fleshy column of the flower.

Physostegia virginiana: Physostegia virginiana (obedient plant, obedience, or false dragonhead) is a species of flowering plant in the mint family, Lamiaceae.  It is native to North America, where it is distributed from eastern Canada to northern Mexico.  "Physostegia" are known commonly as obedient plants because a flower pushed to one side will often stay in that position.  The name false dragonhead refers to the dragonheads of the related "Dracocephalum", a genus to which the plant once belonged.

Supporting paragraphs: Dracocephalum Rhynchostylis
Answer: Dracocephalum